Sporophytes and Gametophytes Differ from Each Other Genetically Because

Sporophytes and gametophytes differ from each other genetically because

A) mitosis leads to larger gametophytes than sporophytes in mosses but to larger sporophytes than gametophytes in ferns.
B) mitosis produces the gametes in plants, but meiosis produces gametes in animals.
C) the sporophytes have one set of chromosomes from each parent, while gametophytes have only one set of chromosomes.
D) the chromosomes in the spores come from both parents, but the gametes only have one set of chromosomes.
E) gametophytes are evolutionarily more ancient than sporophytes, so their sequences have diverged.