In regions that receive significant amounts of acid rain, periphytic algae are observed coating rocks, plants, and other submerged objects in lakes and ponds. What role does acid rain play in the increased population of periphytic algae?

A. The change in pH destroys herbivores present in the lake.
B. Algae come down along with acid rain and infest the water bodies.
C. Algae are formed by the rotting of submerged objects due to acid rain.
D. Acid rain adds nutrients essential for the growth of algae to the water bodies.

((nvm, answer is a)