[单选题]
What happens to the kini (-p nz* e7at03m-vvjsx.onz eti1y2h. oqbtb9d ep ,m2adyy, +uc energy of a speedy proton when its relativistic mass doublde,.uyyd oq2 9 b+hpmb1a, 2tyes?
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.
