[单选题]
What happens to the kint--k5a :z*jy8pycmr1(rmc x ew4oh m+etic energy of a ssimvu k yaq/l)i;f--ipq3w-+ w. h6tdpeedy proton when its relativistic mass doubles?u/ f im wi+qyi;tq)h-spa-63.wdk l-v
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.
