Final answer:
Angiosperms can undergo double fertilization, where one sperm forms a diploid zygote and another forms triploid endosperm, contributing to their diversity.
Step-by-step explanation:
Angiosperms, also known as flowering plants, have a unique reproductive process called double fertilization. In this process, one sperm fertilizes the egg, forming a diploid zygote, while the second sperm fuses with two polar nuclei to form a triploid cell that becomes the endosperm, providing nutrients for the developing embryo. Therefore, the correct answer to which of the following an Angiosperm can undergo is A) Double Fertilization.
This process ensures that after the first fertilization, no other sperm can enter, creating a block to polyspermy and contributing to the high diversity seen among angiosperm species.