Which selection from this section supports the conclusion that exploring the aquarium is a healthy activity for the penguins?

(A) The caretakers want to encourage them to explore, problem-solve and express natural behaviors."

(B) Located in South America, it is the largest river system and rain forest on Earth.

(C) At 30 years old, Wellington is the oldest penguin at the aquarium.

(D) Some of the penguins went on a field trip to meet other animals at Shedd.