The main plant body of bryophytes is 

A. more differentiated than algae

B. lacks true roots, stem or leaves

C. gametophytic that usually occurs in damp, humid and shaded localities.

D. prostrate or erect and attached to substratum by unicellular or multicellular rhizoids.

The plant body of bryophytes is more differentiated than that of algae. It is thallus-like and prostrate or erect, and attached to the substratum
by unicellular or multicellular rhizoids. They lack true roots, stem or leaves. They may possess root-like, leaf-like or stem-like structures. The
main plant body of the bryophyte is haploid. It produces gametes, hence is called a gametophyte.