Three point charges +q, −2q and +q are placed along x-axis at points x = −1 m, x = 0 m and x = 2 m r

Three point charges +q, −2q and +q are placed along x-axis at points x = −1 m, x = 0 m and x = 2 m respectively. The potential energy of the system is: (A) − q² / (π ε₀) (B) − 2q² / (3 π ε₀) (C) q² / (4 π ε₀) (D) − 5q² / (4 π ε₀)