What is a difference between them

Human Sperm and eggs both consist of single cells. What is a difference between them?
a) Sperm have more chromosomes than eggs
b) Eggs have more chromosomes than sperm
c) Sperm have a larger surface area to volume ratio than eggs
d) Eggs have a larger surface area to volume ratio than sperm

Thanks for the help :)

c. Smaller objects always have a larger surface to volume ratio than larger ones of approximately the same shape.

C.