TOEFL Listening: ETS-TOEFL听力机经 - DS5GWHXY18LBE141P$

What is the professor's opinion about the Snowball Earth hypothesis? A. Its basic premise is accurate and further study will validate it. B. It would be more plausible if the time frame were longer. C. It has some merit but a closer examination reveals flaws. D. It will probably never be completely discredited.