50 POINTS! How does soil form on an island that is made of cooled rock from a volcanic eruption?

A. Soil forms when parts of the lava cool into very small rocks and dust.
B. Soil forms from the constant movement of species in and out of the community.
C. Soil forms when lichens and mosses grow, break down rocks, and die.
D. Soil forms when large trees take over the community from small bushes.