Which of the following is true about diabetes? 20 points plz me asap

a. the pancreas overproduces glucose, and so insulin must be injected to reduce glucose levels.

b. the pancreas underproduces glucose, and so insulin must be injected to increase glucose levels.

c. the pancreas overproduces insulin, and so glucose must be injected to regulate insulin levels.

d. the pancreas underproduces insulin, and so insulin must be injected to regulate glucose levels.