The Total Energy of a Moving Electron Is $0.758 \mathrm { MeV }$

Multiple Choice

The total energy of a moving electron is $0.758 \mathrm { MeV }$ . What is the speed of the electron in terms of $c$ ? The rest mass energy of an electron is $0.511 \mathrm { MeV }$ .

A) $0.306 \mathrm { c }$
B) $0.794 c$
C) $0.739 c$
D) $0.933 c$