[单选题]
What happens to the total re+m1l p+mbb;bm latienff /gqvz ,cp8bozv+2m 4 v2 ;2t8q zzzjp/u.vistic energy of a speedy proton when its relativis2vpm,/+8z2j2u bncq 4;z8epqfv vf z/tzo.gztic mass doubles?
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.
