Which of the following is not an ape?
tamarin
The correct option is D
Explanation of the correct option :
Tamarin belong to the monkey species not the apes species.
Explanation of the incorrect option:
Option A, Option B and Option C:
The gorilla, chimpanzee, gibbon, and orangutan are called great apes in recognition of their comparatively large size and humanlike features.
Final answer: Tamarin is not a ape.