Question

what is the source of parent material for soil?
bacteria and algae in water
rock pieces from bedrock
water and wind currents

Explanation:

Soil parent material is derived from the weathering of bedrock, which breaks down into rock pieces. Bacteria/algae in water are not the source of parent material, and water/wind currents are agents of erosion/transport, not the source of the parent material itself. So the correct option is the one about rock pieces from bedrock.

Answer:

B. rock pieces from bedrock (assuming the middle option is labeled B; if the first is A, middle B, last C, then B. rock pieces from bedrock)