What is the impact of the microbial carrying capacity in the soil with worms?

Effect of earthworms on soil

Earthworms need the food and habitat provided by surface residue, and they eat the fungi that become more common in no-till soils. As earthworm populations increase, they pull more and more residue into their burrows, helping to mix organic matter into the soil, improving soil structure and water infiltration.

Explanation:

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.