The correct answer is: D. needs
A need is something that is essential for survival, such as food, water, and shelter. A want is something that is desired but not essential, such as a new car or a fancy house. An aim is a goal that someone sets for themselves, such as getting a good job or going to college. A pleasure is something that gives someone enjoyment, such as eating a delicious meal or watching a funny movie.
In the sentence “He earns enough to satisfy his wants,” the word “wants” refers to the things that the person desires but does not need. These things could include a new car, a fancy house, or anything else that the person would like to have but does not absolutely need to survive.
The other options are incorrect because they do not refer to things that are not essential for survival. A need is something that is essential for survival, such as food, water, and shelter. An aim is a goal that someone sets for themselves, such as getting a good job or going to college. A pleasure is something that gives someone enjoyment, such as eating a delicious meal or watching a funny movie.