The correct option is D Free nuclear endosperm
Coconut water is the endosperm part of the coconut plant. Endosperm is the most common nutritive tissue for the development of embryos in Angiosperms and develops as post-fertilization structure from the primary endosperm nucleus. The coconut endosperm is a nuclear type. In very young coconut fruit the endosperm is found as a clear fluid in which float numerous nuclei of various sizes. This fluid is compactly filling the embryo sac in which the embryo is developing.