Context: Mammals are a group of animals with similar traits. The following traits can be used to identify mammals:
They feed their offspring milk.
They have fur or hair. Observe the animals and read the descriptions.
Select the one animal that has all of the mammal traits listed above.
A. Gray tree frogs hatch from eggs without shells. They live underwater when they are tadpoles. They move onto land when they become adults. The moist skin of adult gray tree frogs can be green or gray. The color of their skin helps them hide on rocks or plants.
B. African elephants have thin hair covering their body. Female elephants feed their offspring milk. Elephants live in groups called herds. The oldest female in the herd is usually the leader.
Identify the correct choice from the options below and respond with the letter of the correct option.

B