Physics · Electrostatic Potential

If the distance \( r \) from an electric dipole is very large compared to its length \( 2a \) (\( r \gg a \)), how does the electrostatic potential \( V \) vary with distance \( r \)?

1. A
   \( V \propto \frac{1}{r} \)
2. B
   \( V \propto \frac{1}{r^3} \)
3. C
   \( V \propto \frac{1}{r^2} \)
4. D
   \( V \propto r^2 \)