Tobacco Smokers (And Those Exposed to Tobacco Smoke)are at Greater

Tobacco smokers (and those exposed to tobacco smoke) are at greater risk of an ectopic (tubal) pregnancy.Based on your understanding of the structures of the cytoskeleton,what is the best explanation?

A) Tobacco smokers tend to get pregnant when they are younger.
B) Tobacco interferes with the functioning of the flagella propelling sperm.
C) Tobacco interferes with the transfer of oxygen to the uterus, thereby forcing the zygote to implant in a fallopian tube.
D) Tobacco interferes with the sweeping motion of cilia that aids in the movement of the egg toward the uterus.