An electron was accelerated from rest through a potential difference of 990 V . What is its speed? (Use the mass of an electron \( =9.11 \times 10^{-31} \mathrm{~kg} \) . the mass of proton \( =1.67 \times 10^{-27} \mathrm{~kg} \) and the charge of an electron \( =1.6 \times 10^{-19} \mathrm{C} \) ).

A \( 2.35 \times 10^{7} \mathrm{~ms}^{-1} \)

B \( 1.36 \times 10^{7} \mathrm{~ms}^{-1} \)

C \( 2.75 \times 10^{7} \mathrm{~ms}^{-1} \)