Mammary glands in whales and humans

A) are a synapomorphy for these species and other mammals.
B) are homologous traits.
C) were likely present in the most recent common ancestor of humans and whales.
D) All the given choices are correct.
E) None of the given choices are correct.

Mammary Glands

Specialized organs in mammals that produce milk to nourish newborns, a key characteristic of mammalian species.

Synapomorphy

A characteristic or feature present in an ancestral species and shared exclusively (in more or less modified form) by its evolutionary descendants.

Homologous Traits

Features in different species that are similar because of a common evolutionary origin, not necessarily similar in function.