by burrowing under the soil by crawling around in the pan by staying where it was placed by trying to crawl out of the pan
I gave my students this multiple choice 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?

Only one answer is correct among these 4 choices:
- by burrowing under the soil
- by crawling around in the pan
- by staying where it was placed
- by trying to crawl out of the pan

Could you tell me which one is correct?

by burrowing under the soil