TOEFL Listening: ETS-TOEFL听力机经 - 8266E5NE38N96_5EP$

Why does the professor mention the season on Titan in which the study of its largest lake was conducted? A. To suggest that the study was too short. B. To make a point about cycles of precipitation and evaporation. C. To acknowledge a difference between weather cycles on Earth and Titan. D. To describe a theory that explains freezing and thawing cycles on Titan.