Answer:
Option D. It is the behavior that seeks to improve the well-being of other people.
Explanation:
The reason is that prosocial behavior are motivated by altruism, which is a behavior of a person to benefit others and this may be at the cost of oneself. So their is no mean in this charity work and is purely an act of humanity. This prosocially motivated behavior is the purest form of altruism hence the only correct option here is option D.