Which of the Following Illustrates Altruism

Multiple Choice

Which of the following illustrates altruism?

A) Parent birds clean out their nests.
B) Parent birds spend much of their time and energy feeding their young.
C) Birds of a different species care for a cuckoo egg.
D) Males sing to attract females as mating partners.
E) A mother bird pretends to be wounded to distract a predator away from her young.