Which Cell Fuses with a Sperm Cell to Accomplish Fertilization

Question

Which cell fuses with a sperm cell to accomplish fertilization?
A) an oogonium
B) a primary oocyte
C) a secondary oocyte
D) a tertiary oocyte

Accepted Answer

A secondary oocyte is the correct answer because it is the stage of the female gamete that undergoes fertilization by a sperm cell. After fertilization, the secondary oocyte completes its second meiotic division to become a mature ovum.