To What Is the "Double" Part of Double Fertilization in Flowering

Multiple Choice

To what is the "double" part of double fertilization in flowering plants referring?

A) Two sperm penetrate and fertilize the egg at the same time.
B) Two sperm fertilize one egg each,producing two embryos.
C) One sperm fertilizes the egg to form the embryo,and,after several cell divisions,a second sperm fertilizes the same egg forming another embryo.
D) There are two fusion events involving separate sperm: one fuses with the egg forming an embryo,the other with a cell to form the endosperm.