As Cited in Your Text,which of the Following Best Describes

As cited in your text,which of the following best describes why few people in India or Africa are affected by dementia?

A) Relatively few people live into late adulthood.
B) Their diets are primarily made of fish,which is high in the B vitamins.
C) They have lower levels of calcium in their diet.
D) There are less environmental teratogens,which are known to cause dementia.