TOEFL Listening: ETS-TOEFL听力机经 - 2P3P9GZ44U78X2TFP$

Why does the professor say this? A. To point out that Gorrie lacked sufficient training in science B. To imply that other people were working on similar inventions at that time C. To suggest that inventing a refrigeration machine was not a difficult task D. To indicate that she is impressed with Gorrie's initiative