
Passage: Because some university teachers have overseas doctorates, some overseas doctorates have a very high level.
Question: Which of the following options ensures that the above statement is correct?
A. A.All the teachers in colleges and universities have a very high level
B. B.Not all college teachers have a high level
C. C.Some university teachers have a very high level
D. D.All high-level teachers have overseas doctorates
Answer: