One Adaptation That Was Necessary for Charophytes to Move onto Land

One adaptation that was necessary for charophytes to move onto land was the protection of the embryo from desiccation. In mosses, the embryo, called a developing sporophyte, is

A) protected within the archegonium and nourished by the "foot" growing down into the gametophyte tissue.
B) protected by the antheridia and nourished by the rhizoids.
C) protected by the protonema and nourished by the "foot" growing down into the gametophyte.
D) protected within the antheridia and nourished by the "foot" growing down into the sporophyte tissue.
E) not protected since mosses are not vascular plants.