Why would measuring blood glucose levels in an individual, 20 to 30 minutes after they drink a liter of milk, indicate whether they are able to digest lactose.

a. When lactose is digested by lactase in the small intestine, different cells in the body start releasing glucose into the bloodstream.
b. When lactose is digested by lactase, the glucose that is produced enters the bloodstream from the small intestine.
c. When lactose enters the large intestine, glucose is digested by bacteria and then enters the bloodstream.
d. The fats and proteins in milk are digested by the body, causing glucose levels in the blood to increase.