Which Sentence Best Describes the Relationship Between Gametophyte and Sporophyte

Which sentence best describes the relationship between gametophyte and sporophyte in flowering plants?

A) The gametophytes are smaller than the sporophytes, and are retained inside sporophyte for all or part of their lives.
B) The gametophytes are smaller than the sporophytes, and do not nourish themselves.
C) The gametophytes and sporophytes are roughly equal in size, and both nourish themselves.
D) The gametophytes are usually larger than the sporophytes, but both gametophytes and sporophytes nourish themselves.