​Physical activity can be a useful treatment for_______ and may offer some protection against the development of _______.

A) ​Type II diabetes; Type I diabetes
B) ​Type I diabetes; Type II diabetes
C) ​Type I diabetes; gestational diabetes
D) ​Type I diabetes; Type I diabetes

Physical activity can improve insulin sensitivity and glucose metabolism, which are key factors in managing Type II diabetes. In terms of protection against development of diabetes, Type II diabetes is more commonly associated with lifestyle factors such as obesity and inactivity, while Type I diabetes is an autoimmune disorder that is not typically related to lifestyle factors. Therefore, physical activity is more relevant in the context of Type II diabetes.