In Nearsightedness, the Rays Passing Through the Eye Converge Before

In nearsightedness, the rays passing through the eye converge before they reach the retina. To correct this, all of the following are valid (although not necessarily practical) means except for

A) inserting a negative lens in front of the eye.
B) relaxing the muscles that control the shape of the crystalline lens of the eye so that the lens flattens somewhat.
C) decreasing the index of refraction of the cornea and aqueous humor that covers the crystalline lens of the eye.
D) All of the above are true.