
Passage: No chordates are ductal animals, all pterosaurs are ductal animals, so, no pterosaurs belong to the great ape family.
Question: Which of the following statements must be assumed by the above reasoning?
A. A.All great apes are ductal animals.
B. B.All great apes are chordates.
C. C.No great apes are chordates.
D. D.No chordate is a pterosaur.
Answer: