The correct option is
C Haploid and is found in mosses
Mosses:
Protonema is found in the life cycle of mosses. It is the first gametophytic stage. The haploid spores germinate to form a juvenile protonemal stage represented by a filamentous structure, which gives rise to erect gametophores.
Final answer:
a. Haploid and is found in mosses.