A scientist is wanting to test the speed of sound. his assistant walked 400 meters away and emitted a sound. The scientist heard the sound 1.2 seconds later. he then has his assistant make the same sound under lake water from 400 meters away. Which is true as a result?

A. The scientist will not hear the sound, because sound doesn’t travel under water.

B. The scientist also heard the 1.2 seconds later while under water.

C. The scientist will hear the sound in less than 1.2 seconds.

D. It will take more than 1.2 seconds for the scientist to hear the sound.