[单选题]
What happens to the total relati 6jv0kt3i pb;qncq./p 1 yu-0a+k: pvhom4rcavistic energy of a speedy proton when its relativistic mass doubles?vp oy4-0au1mh rakc:+
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.