[单选题]
What happens to the kinetic energy of a speedy proton when its relq:( dv3 e/(wf( gnogbuativ+,ld 2jnyd qsif d696vistic mass doubles? n6sj+iqfvl2d d6dy9,
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.
