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 for this phenomenon?

A) Tobacco interferes with the microtubule network of eggs, thus weakening their structure.
B) Tobacco interferes with the functioning of microtubules in sperm cells.
C) Tobacco interferes with microfilament formation in sperm, thereby forcing the zygote to implant in the tubes of the oviduct
D) Tobacco interferes with sweeping motion of cilia that aids in the movement of the egg toward the uterus.