-
A.
gamete -
B.
fetus -
C.
embryo -
D.
zygote
Correct Answer: Option A
Explanation
Gametes are reproductive cells (sex cells) that unite during sexual reproduction to form a new cell called a zygote. Male gametes are sperm and female gametes are ova (eggs).
Embryo is the stage of animal development in the uterus before the animal is considered a fetus. In humans this is equivalent to the first three months.
There is an explanation video available below.