Why is it significant that pollen contains a multicellular male gametophyte instead of just male gametes?

A)The non-gamete cells of the male gametophyte control the growth and development of the pollen tube.
B)The non-gamete cells of the male gametophyte provide nutrition that supports the development of the embryo.
C)The non-gamete cells of the male gametophyte undergo meiosis.
D)The non-gamete cells of the male gametophyte provide protection from desiccation and UV radiation.