Scurvy, a Debilitating Disease Caused by the Lack of Vitamin

Scurvy, a debilitating disease caused by the lack of vitamin C in a diet did not affect sailors until

A) they reached Africa which did not have many fruits.
B) they finally reached Japan which had no medical knowledge to speak of.
C) they started taking fruit with them on voyages (which became rotted) .
D) they started venturing out farther into oceans and away from coasts.