The Pimas Are a Group of People Living in the Southwestern

The Pimas are a group of people living in the southwestern United States and Mexico. Although Pima Indians living in the United States and Mexico have a similar genetic background, a five-fold increase in the incidence of type II diabetes mellitus among U.S. Pima has been reported. The body mass index (a measure of obesity) of Mexicans of non-Pima descent, Mexicans of Pima descent, and Pimas living in the United States is shown in the accompanying figure. Based on this information and the graph, what can you infer about the incidence of type II diabetes mellitus?

A) Obesity is a risk factor for development of type II diabetes mellitus.
B) If you maintain a normal body weight (body mass index less than 25) , you will not get type II diabetes mellitus.
C) The incidence of type II diabetes mellitus has increased in the past ten years.
D) People who develop type II diabetes mellitus are typically diagnosed in childhood or adolescence.