Question: Earthworms live underground in the soil. As they move through the soil, they create tunnels. The tunnels help improve the soil. Plants grow better in soil that has earthworms. Which statement explains how earthworm tunnels help plants?

  Options: 
 A. Earthworm tunnels bring heat into the soil that warms plant roots.
 B. Earthworm tunnels loosen the soil so plant roots can easily grow
 C. Earthworm tunnels allow sunlight to reach the plant roots in the soil.
 D. Earthworm tunnels create places where insects can hide and protect plant roots.
Answer: B