The correct option is C male gametophyte
Selaginella is a heterosporous pteridophyte. It produces two kinds of spores, microspore and macrospore.
Microspore germinates to form male gametophytes and macrospore germinates to form female gametophytes.
Sporophyte is the nonsexual phase in the alternation of generations—a phenomenon in which two distinct phases occur in the life history of the organism, each phase producing the other.
Protonema is found in bryophytes. Spores germinate to form protonema.