Two charges positive q are placed at a distance of 2a, and a dipole moment p is placed at a distance a from q. What is the force on the dipole moment?

a) 1/(4πε₀) p/a²
b) 1/(2πε₀) p/a²
c) 1/πε₀ p/a²
d) 2/πε₀ p/a²