Going up stairs is a clear example of gross motor mobility because it uses large muscle groups to lift and move the body, maintain balance, and coordinate the trunk, hips, and legs as you alternate steps. Mastery of stair climbing shows strength, endurance, and motor planning in the lower body, all of which are key aspects of gross motor development. Other options tap into different skills: cooperative play relates to social interaction and communication, recognizing colors is a cognitive/visual skill, and brushing teeth mainly involves fine motor control of the hands and fingers for self-care. So climbing stairs best demonstrates improved gross motor mobility.

Conserving energy often comes down to cutting the amount of energy used for everyday needs, and heating water is a big part of that in many homes. Using hot water sparingly directly lowers the energy your heater has to supply, which saves both energy and money. Simple habits add up: taking shorter showers, using cooler water for laundry when possible, running the dishwasher only with full loads and on an eco or energy-saving cycle, and keeping hot-water pipes well insulated. In contrast, turning the thermostat up increases energy use, running a dishwasher with only a partial load wastes energy per item, and leaving doors and windows open in winter lets heat escape. So using hot water sparingly is a practical, effective way to conserve energy.

Burping after feeding helps release air the baby swallows, which can reduce discomfort and spit-up. The best technique is to hold the baby over your shoulder so the head is supported and the back is upright, then gently pat the back. The pressure from patting aids the release of trapped air, and the position uses gravity to help air come up while you keep the baby safe and comfortable. Shaking the baby is dangerous and should never be done. Laying the baby on the stomach and patting the chest isn’t a standard or reliable method for burping, and feeding again without burping can leave air trapped and the baby uncomfortable.

Credit is the ability to obtain money, goods, or services now with the promise to pay for them later. It relies on trust that you will repay under agreed terms. The option that describes an arrangement to receive cash, goods, or services now and pay for them in the future best captures this idea. Credit isn’t just debt itself or a score; it’s the system or mechanism that allows borrowing. A measure of debt is about what you already owe, not what credit is. A credit score shows how creditworthy you are, not the concept of credit itself. A loan is a specific borrowing product, while credit covers broader arrangements like using a credit card or line of credit.