Which of the Following Is NOT a Factor That Protects

Multiple Choice

Which of the following is NOT a factor that protects North Americans from many parasitic worm infections?

A) Much of the U.S.has bitter cold winters.
B) Most of the population wears shoes.
C) We usually cook our meat and there are few raw meat dishes.
D) We have superior drugs and surgeons.
E) We do not use human excreta ("night soil") to directly fertilize crops.