According to Bohr's theory,the expressions for the kinetic and potential energy of an electron revolving in an orbit are given respectively by:

• A
  $ + \frac{{{e^2}}}{{8\pi {\varepsilon _0}r}}$ and $ - \frac{{{e^2}}}{{4\pi {\varepsilon _0}r}}$
• B
  $ + \frac{{8\pi {\varepsilon _0}{e^2}}}{r}$ and $ - \frac{{4\pi {\varepsilon _0}{e^2}}}{r}$
• C
  $ - \frac{{{e^2}}}{{8\pi {\varepsilon _0}r}}$ and $ - \frac{{{e^2}}}{{4\pi {\varepsilon _0}r}}$
• D
  $ + \frac{{{e^2}}}{{8\pi {\varepsilon _0}r}}$ and $ + \frac{{{e^2}}}{{4\pi {\varepsilon _0}r}}$