TOEFL Listening: ETS-TOEFL听力机经 - O0YJ5VB132VX288EP$

What does the professor say could affect global ocean currents? A. Increased evaporation over the ocean. B. A change in the amount of fresh water flowing into the ocean. C. A change in the movement of Earth's crust. D. An increase of sediment at the bottom of the ocean.