Which sentence is a run-on sentence?

A.
Anteaters eat more than just ants; they also eat termites, soft fruit, and bird eggs.

B.
Dolphins use echolocation to locate objects or other dolphins around them.

C.
Female kangaroos carry their young in a pouch; male kangaroos do not.

D.
Chimpanzees can speak with humans they can use sign language.
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