Final answer:
A negative feedback loop in social studies refers to a situation where a change in a particular factor results in a response that counteracts or reverses the original change. In this case, the example of a negative feedback loop is a country with a high birth rate and a high death rate will eventually experience population decline.
Step-by-step explanation:
A negative feedback loop in social studies refers to a situation where a change in a particular factor results in a response that counteracts or reverses the original change. In this case, the example of a negative feedback loop is option (C): A country with a high birth rate and a high death rate will eventually experience population decline. When a country has high birth and death rates, the population growth is likely to decline over time due to the decreasing number of individuals reaching reproductive age and the higher mortality rate.