The main idea is recognizing a specific UN treaty that expands abolition beyond traditional slavery. The instrument in question is the 1956 Supplementary Convention on the Abolition of Slavery, the Slave Trade and Institutions and Practices Similar to Slavery. It was created to fill gaps in the earlier 1926 Slavery Convention by extending prohibition to practices that resemble slavery—such as debt bondage and certain forced labor arrangements—and it requires states to take measures to eradicate these practices. This makes it distinct from the Trafficking in Persons Protocol of 2000, which focuses on trafficking within a crime framework; the Universal Declaration of Human Rights from 1948, which is a broad rights charter; and the 1926 Slavery Convention, which is the earlier instrument that the 1956 provision supplements.

The key idea here is how laws acknowledge and protect partnerships between people of the same sex, and how that recognition has evolved in recent times. This issue covers things like whether same‑sex couples can marry, or be recognised as distinct de facto or civil union partners with the same rights and responsibilities as heterosexual couples. It matters in practical terms—for example, rights to inheritance, property, parenting, alimony, social security, and immigration—and it highlights how legal systems respond to social change to ensure equal treatment. Surrogacy and birth technologies focus on how children are created rather than the formal recognition and status of the relationship itself. Care and protection of children deals with safeguarding children’s welfare, often across various family structures, rather than the formal recognition of a couple’s partnership. The changing nature of parental responsibility addresses who is legally responsible for a child, which can be influenced by the relationship status but isn’t specifically about recognizing same‑sex relationships. Therefore, the concept that directly targets recognition of same‑sex relationships is the best fit.

The key idea is that only one instrument formally defines torture and sets an absolute, non-derogable prohibition on it. That instrument is the Convention Against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment. It defines torture in its article 1 and makes clear that no exceptional circumstances whatsoever can justify it, committing states to prevent, prohibit, and punish torture in all circumstances. It also includes protections like non-refoulement to prevent returning someone to a place where they could be tortured. The other options don’t fit as the defining treaty. The treaty on the rights of persons with disabilities focuses on protections for disabled people rather than a global definition of torture. The International Court of Justice is a judicial body, not a treaty. The Universal Declaration of Human Rights is a declaration, not a binding treaty with a formal, universal prohibition tied to a precise definition.

Jurisdiction is the power of a court to hear and decide a case. This authority comes from law and depends on factors like where the dispute arose (territorial or geographic reach), the type of issue (subject-matter jurisdiction), and who is involved (personal jurisdiction). If a court lacks jurisdiction, it cannot lawfully proceed, no matter what the parties argue. The other terms describe different ideas: the adversary system is about how cases are litigated between opposing sides; precedent refers to prior court decisions that guide future rulings; SAMPLEremedies are the relief sought or awarded by the court. Understanding jurisdiction helps explain why a case must be heard in a specific court or why it cannot be heard there at all.