Certified Ophthalmic Medical Technologist (COMT)

Answer: B -  A blocked blood vessel is the typical cause of amaurosis fugax.

Amaurosis fugax is a type of vision loss caused by a temporary blockage of a retinal artery, resulting in a sudden, painless loss of vision in one eye. It is usually caused by a small blood clot or an accumulation of fat-rich material, known as a plaque, which can block the blood vessels.