High rates of obesity and diabetes among the Tohono O'odham Nation of Arizona

A) stem from genetic changes that occurred in this population after their river water was diverted to service non-native farmers.
B) are not linked to any change in their diet
C) are seen in even the very first historical records ever kept on their health
D) are directly linked to the diversion of their river water to service non-native farmers upstream
E) can be sustainably solved with gene therapy