What animals have mammary glands? A. snapping turtle, kangaroo, and bullfrog
B. bullfrog, tuna, and human
C. lamprey, tuna, and bullfrog
D. kangaroo, rhesus monkey, and humans

All of those animals are mammals, which are the only animals with mammary glands. The term "mammary" comes from "mammal".

A turtle is a reptile, and a bullfrog is an amphibian. So this rules out choice A. Choice B is ruled out for similar reasons, and because a tuna is a fish and not a mammal.

Choice C is ruled out because none of the animals listed here are mammals.

it is a. i hope this .