Three point charges are arranged in the $x-y$ plane as shown in the figure. Assuming that the potential at the infinity is zero, the approximate potential at the point P in the figure is

• Correct answer
  A

  $q /\left(100 \pi \epsilon_0 a\right)$
• B

  $q /\left(20 \pi \epsilon_0 a\right)$
• C

  $\sqrt{3} q /\left(40 \pi \epsilon_0 a\right)$
• D

  $q /\left(200 \pi \epsilon_0 a\right)$

Hence, the correct answer is option: 'A'.