The correct option is D Lycopodium
In majority of the pteridophytes all the spores are of similar kinds; such plants are called homosporous and they give rise to bisexual gametophytes.
Lycopodium is a pteridophyte and is homosporous--all spores are equal in size. Selaginella is also a pteridophyte but is heterosporous.
Salvinia and Cycas are heterosporous i.e. they produce two kinds of spores - smaller microspores and larger megaspores.