Question: An earthworm was placed on top of a thick layer of moist topsoil in a pan. The pan was placed in a room with the lights on. How did the earthworm most likely respond to these conditions?

  Options: 
 A. by burrowing under the soil
 B. by crawling around in the pan
 C. by staying where it was placed
 D. by trying to crawl out of the pan
Answer: A