TOEFL Listening: ETS-TOEFL听力机经 - Q5HSU604G44E3311P$

Why does the professor mention silicon? A. To explain why certain materials deteriorate in salt water B. To introduce an idea for making tiny holes to be used in producing droplets C. To express doubt that the required number of droplets can be produced D. To point out the importance of computer models to the project he is discussing