Question

“of course i will help caleb put up posters when he runs for student body president,” stella says. “i’m going to need his help later this year when the marching band holds its annual car wash.” what kind of altruism is stella practicing here?
kin selection
internal rewards
reciprocity
incentivized giving

Explanation:

Stella helps Caleb with the intention of getting help in return for the marching - band car wash. Reciprocity involves the expectation of a return favor. Kin selection is related to helping relatives, internal rewards are about personal psychological benefits, and incentivized giving usually involves external rewards like money. Here, it's about a future favor in return, which is reciprocity.

Answer:

reciprocity