If You Add Energy to an Electron, You Can Get

If you add energy to an electron, you can get it to move faster. This can be done using electromagnetic fields. If an electron is given energy in the amount of 220,000 eV (an electron volt unit of energy) it can reach speeds of 2.70 × 10⁸ m/s. At this speed what would the mass of an electron be? An electron has a rest mass of 9.109 × 10^-28 g.

A) 2.10 × 10^-30 g
B) 2.46 × 10^-19 g
C) 3.37 × 10^-36 g
D) 2.10 × 10^-27 g
E) 9.109 × 10^-28 g