Final answer:
Type 2 diabetes is the most common form of diabetes and is often associated with obesity. It arises primarily in adulthood and is caused by the insensitivity of fat cells to insulin. The least common form of diabetes is Type 1 diabetes.
Step-by-step explanation:
Option D: The least common form of diabetes is incorrect. Type 2 diabetes is the most common form of diabetes, accounting for about 90 percent of all cases. It generally develops due to insulin resistance, where the cells of the body become unresponsive to insulin. This form of diabetes is often associated with obesity, and it primarily arises in adulthood.