Which one has the largest gametophyte?

Explanation

Mosses have the largest gametophytes. The gametophyte is the dominant generation in mosses, meaning that it is the larger and more conspicuous generation. Moss gametophytes can be up to several inches tall and can have many branches and leaves. Cycas are gymnosperms, which means that they have naked seeds. The gametophyte generation in gymnosperms is very small and is reduced to just a few cells. The sporophyte generation is the dominant generation in gymnosperms. Angiosperms are flowering plants. The gametophyte generation in angiosperms is also very small and is reduced to just a few cells. The sporophyte generation is the dominant generation in angiosperms. Selaginella is a type of vascular plant. The gametophyte generation in Selaginella is slightly larger than the gametophyte generation in gymnosperms and angiosperms, but it is still much smaller than the gametophyte generation in mosses. Therefore, the correct answer is moss.