What Is the Correct Sequence of Organisms If a Community

Multiple Choice

What is the correct sequence of organisms if a community is going through secondary succession?
a.grasses establish themselves in the community
B.shrubs establish themselves in the community
C.soil formation occurs
D.trees establish themselves in the community

A) c - a - b - d
B) a - b - c - d
C) d - c - a - b
D) c - a - d - b
E) a - c - b - d