Read the features given below and identify the plant A, B and C.A - Plants with protonemal stage in the life cycleB - Heterosporous vascular cryptogamC - exposed ovules and seeds

The protonema stage is seen in life cycle of mosses (e.g., Sphagnum) and it develops directly from a spore.Some of the pteridophytes or vascular cryptogams (e.g., Selaginella) produce two kinds of spores i.e., microspores and megaspores. This habit is known as heterospory.In gymnosperms, ovules remain exposed both before and after fertilization due to the absence of flowers and fruits e.g., Sequoia.