Final answer:
Anna joined Timothy's team for the animal rescue project because of a solidary benefit, as her decision was influenced by a passion for animals and a desire to work with others who share similar interests.
Step-by-step explanation:
Anna's decision to join Timothy's team for an animal rescue project seems to be influenced primarily by a solidary incentive. This type of incentive involves the pleasure of interacting with like-minded individuals and the gratification of publicly expressing one's beliefs. A solidary benefit, as stated in the information provided, is best exemplified by joining a group to be with others like you (option a) or because you care about a cause (option c).
Considering Anna's motivation as an animal lover, it is clear that her reason for joining aligns with option c. It reflects a desire to engage in activities that resonate with her passion for animals, which provides her with personal satisfaction and the joy of collaboration with other animal enthusiasts. Moreover, her choice does not seem to be influenced by utilitarian motives, such as monetary gain or compulsory participation, which separates her motivation from options like option b or option d related to utilitarian organizations.
An examination of the other incentives described — such as purposive and material — further supports the conclusion that Anna's primary reason for joining is the solidary benefit she receives from working on something she genuinely cares about with teammates who share her interest. Similar to the way members of the ACLU and the Union of Concerned Scientists join because of shared beliefs and concerns, Anna joins Timothy's team to connect with individuals with a common passion for animal protection and rescue.