Final answer:
When membership in an organization allows for a reduction in the price of museum tickets, it is called a solidary benefit. The correct answer is d.
Step-by-step explanation:
The correct answer is d. solidary benefit. When membership in an organization allows for a reduction in the price of museum tickets, it is called a solidary benefit. This type of benefit is based on the concept that people like to associate with those who are similar to them and find pleasure in interacting with like-minded individuals. It is a non-material incentive that appeals to individuals who join a group because they care about a cause or share a common interest.