Why do lichens and mosses get mostly replaced by larger plant species during succession?

Select one:
a. Larger plants are autotrophs, but lichens and mosses are heterotrophs.
b. Larger plants compete for resources like space, sunlight, and soil nutrients more successfully.
c. Larger plants do not use as many resources as lichens and mosses.
d. Larger plants are not edible, so they are more likely to avoid predation.
e. None of these.