The main idea here is identifying which agreement the World Trade Organization was created to replace. The WTO took over the multilateral trade rules from the General Agreement on Tariffs and Trade, or GATT, after the Uruguay Round, with the Marrakesh Agreement formalizing the transition in the mid-1990s. GATT began in 1947 as a framework to reduce tariffs and regulate trade in goods. The WTO expanded on that by covering not just goods but also services and intellectual property, building a more comprehensive system. The other options are different international institutions with distinct roles: the IMF handles monetary cooperation and financial stability, UNCTAD focuses on trade and development, and the World Bank provides development financing. Thus, the agreement the WTO replaced is GATT.

Natural gas reserves are the amount of gas that can be recovered with current technology and economic conditions, i.e., proven reserves. By this measure, Russia has the largest proven natural gas reserves, thanks to massive fields in Western Siberia and other regions that have supported long-term, large-scale production. Iran and Qatar are also tremendously rich in gas—Iran with huge onshore and offshore fields and Qatar with the vast North Field—but their total proven volumes are not larger than Russia’s. The United States has significant reserves too, especially from shale, but not more than Russia. So the best answer reflects Russia’s position as the country with the largest proven natural gas reserves.

Deepest points on Earth occur in ocean trenches where one tectonic plate sinks beneath another. The deepest location is in the Mariana Trench, located in the western Pacific Ocean, at the Challenger Deep. The Pacific hosts the greatest depths overall because many subduction zones line its margins, forming trenches that reach farther down than those in other oceans. In the Atlantic, Indian, and Arctic Oceans, the deepest trenches exist but reach shallower depths due to different tectonic configurations and activity.

Charminar was put up to mark the founding of Hyderabad by Muhammad Quli Qutb Shah, the fifth ruler of the Qutb Shahi dynasty, around 1591. This era was about establishing a new capital in the Golconda region, and the monument became a symbol of the city. The other figures listed belong to different times and places: Aurangzeb was a Mughal emperor who ruled later; Shah Jahan is known for the Taj Mahal; Tipu Sultan was the ruler of Mysore in the 18th century. So the builder tied to Charminar is Muhammad Quli Qutb Shah.