The clearing allowed mosses to grow quickly. Rock weathering occurred for lichens to grow. Exposed substrates allowed microbes to grow. The soil components remained for plants to grow.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A forest was cleared for the building of a resort, but before construction began, secondary succession set in. Which of these describes why secondary succession appeared so rapidly?
Possibilities:
- The clearing allowed mosses to grow quickly.
- Rock weathering occurred for lichens to grow.
- Exposed substrates allowed microbes to grow.
- The soil components remained for plants to grow.

The soil components remained for plants to grow.