The Roberts family has had a large family garden for several years. Every autumn, after the first frost, they pull up the dead plants and cover the garden rows with black plastic. When it is spring and planting time, they plant seeds though holes they have poked in the plastic. Why do the Roberts use the plastic covering? A. The black plastic keeps the weeds from growing in the bare soil.
B. The black plastic keeps the soil warm so the seeds will grow in the spring.
C. The black plastic helps the organisms that live in the soil survive the winter.
D. The garden space will be covered with grass and animals will graze in the area.