The correct answer is C. Type I diabetes.
Type I diabetes, also known as juvenile diabetes, occurs when the body's immune system attacks and destroys the insulin-producing cells in the pancreas. As a result, the body cannot produce insulin, which is necessary for regulating blood sugar levels.
People with Type I diabetes require regular insulin injections or the use of an insulin pump to manage their blood sugar levels. It usually develops in childhood or adolescence, but it can also develop in adulthood.