Some researchers claim to have found a new way to control blood glucose levels in people with diabetes, and the key to this new therapy is caffeine. They tested mice with diabetes and when the mice took caffeine, The ability to control blood glucose levels is better than that of mice that did not consume caffeine. Based on this, the researchers believe that the past method of controlling blood glucose concentrations in people with diabetes through insulin injections may also be replaced by caffeine in the future. Which of the following, if true, best supports the above conclusion? ["The above research results are published in the world's top medical journals.", 'Injecting daily insulin is more troublesome for diabetics.', 'Research shows that caffeine reduces the risk of rectal cancer and melanoma.', 'Caffeine uptake by kidney cells in mice and humans promotes insulin production.']