In Angiosperms, Two Male Gametes Contained Within a Single Male

In angiosperms, two male gametes contained within a single male gametophyte participate in fertilization. One sperm nucleus combines with the egg to produce a diploid zygote, and the other sperm nucleus combines with two other haploid nuclei of the female gametophyte. This process is called

A) biparental inheritance.
B) multiple paternity.
C) double fertilization.
D) dihybrid cross.
E) single fertilization.