Which is true about type 1 diabetes?
a. it accounts for 5% to 10% of all cases of diabetes.
b. it may often be completely controlled through diet and exercise.
c. it often goes undiagnosed.
d. it usually develops after age 40.

a.It accounts for 5% to 10% of all cases of diabetes.

Explanation:

Type 1 diabetes is also called as juvenile diabetes. It is a form of the diabetes in which the pancreas produces very little insulin.

This results in high levels of blood sugar levels in body. There is no certain age for the development of this disease because this disease arises from environmental as well as genetic factors. (Option D is incorrect)

The symptoms are frequent urination,  increased hunger, increased thirst, etc. The symptoms for the disease typically develop over a very short period of time. (Option C is incorrect)

There is no known way to prevent this type of diabetics. The treatment with insulin is required for survival. It can be manged by diet and exercise but cannot be completely controlled. (Option B is incorrect)

Type 1 diabetes makes up approximately 5–10% of all diabetes cases.

Hence option A is correct.

i think it would be b the increase in body temp

looks like you are missing options or a image.