Why Is Blood Meal Sharing in Vampire Bats Considered to Have

Why is blood meal sharing in vampire bats considered to have evolved via reciprocal altruism?

A) Blood meal sharing often occurs only in captivity.
B) Individuals share food with individuals from whom they have received food.
C) There is no cost of blood meal sharing for the donor.
D) Males and females cooperate to obtain blood meals.
E) Blood meal sharing in nature only involves relatives.

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