The correct option is B Rhizoids of gametophyte
The gametophytic plant body of mosses are differentiated into prostate, branched filamentous, thalloid protonema and leafy erect gametophore.
Rhizoids are multicellular branched with oblique septa.
Sex organs develop from superficial cells at the apex of leafy gametophyte.
Stomata and chlorophyll are present in gametphyte for gaseous exchange, e.g., Funaria.