[单选题]
What happens to the total relativistic energy ofn*h b0vy5+:op ipkwb8 a speedy proton when it8otae+q7k, fu-wy4 y cs relativistic mass dowqef -,7tau 8y 4ock+yubles?
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.
