[单选题]
What happens to the ju 76v7+66wvx k aczeltot eo9fqho4c- (6ite5aval relativistic energy of a speedy proton when its relativistic mass doubl9aeqe6 oh4t(o fvci-5 es?
A. It doubles.
B. It more than doubles.
C. It less than doubles.
D. It must increase, but it is impossible to say by how much.
