Question: Read the information about Alice's science project then answer the question. Alice needed to design a science project. She decided that she wanted to focus her project on how an earthworm's behavior helps it survive. Alice wrote down four ideas about earthworm behavior that she wanted to test. Which idea can be tested experimentally?

  Options: 
 A. Earthworms like the taste of dirt better than sand.
 B. Earthworms are happier in black dirt than red dirt.
 C. Earthworms exist to decompose decaying materials.
 D. Earthworms will move away from direct light sources.
Answer: D