Which piece of evidence would best support the argument for kin selection as a mechanism for the evolution of altruistic behavior?

Question

Which piece of evidence would best support the argument for kin selection as a mechanism for the evolution of altruistic behavior?

An antelope gets separated from the herd, and killed by predators.
A clown fish helps clean parasites off of a sea anemone.
A hippo stops a crocodile from eating an antelope.
A penguin protects its chicks from seagulls.

Answer 1

A penguin protecting its chicks from seagulls would best support the argument for kin selection as a mechanism for the evolution of altruistic behavior. This behavior demonstrates the penguin putting itself at risk in order to protect its offspring, which are genetically related to it. This fits with the idea of kin selection, where individuals behave altruistically towards their close relatives in order to increase the likelihood of their shared genes being passed on to future generations.