[单选题]
What happens to the kinetio5(ulc5ig5f5k 6jsmb +gd/rcc enerpfw5yq sck;4n1ts0p- w 6h ;ksgy of a speedy proton when its relativistic mass dk1wy-;pnssh w56ct;kq4f0 psoubles?
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.