TOEFL Listening: ETS-TOEFL听力机经 - L4T76RG456G688W7P$

What is the professor's opinion of the lunar dynamo theory? A. He believes it should be accepted by all scientists. B. He is concerned that it does not explain irregularities in some Moon rocks. C. He thinks it contradicts a widely accepted hypothesis regarding the Moon's origin. D. He believes there is enough evidence to justify further research.