Answer:
a. They have opposable thumbs with a good grip.
Explanation: b. Their nostrils point sideways. (Incorrect): The direction of nostrils varies among different primate species, but it is not a distinctive feature of Great Apes specifically.
c. They have long prehensile tails. (Incorrect): Great Apes do not have tails. Unlike many other primates, they lack a tail altogether.
d. They have eight bicuspid teeth. (Incorrect): The number of teeth and their specific types can vary among primate species, but eight bicuspid teeth is not a characteristic feature of Great Apes.
e. Females give birth to three or more offspring at once. (Incorrect): Great Apes typically give birth to a single offspring at a time, not three or more.