A famine is when food is scarce and can happen from unfortunate events, such as wars or inflation.
Choice A: Farmers prosper.
This choice can easily be crossed out because farmers lose crops during famines, which is the opposite of what happens.
Choice B: Population grows.
This choice can also be crossed out because during a famine, everyone has less food and lack of food can cause death. In reality, people actually die during famines the population would decrease.
Choice C: People go to war.
Going to war has nothing to do with lack of food, so this choice can also be crossed out.
Choice D: People lack food.
The last choice left is choice D, which makes it the answer. A famine is when food is scarce, which means people lack food.
Your answer is choice D.