The Figure Shows a Group of Three Particles, All of Which

The figure shows a group of three particles, all of which have charge Q = 8.8 nC. How much work did it take to assemble this group of charges if they all started out extremely far from each other? (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

A) 5.5 × 10^-5 J
B) 6.2 × 10^-5 J
C) 5.7 × 10^-5 J
D) 5.9 × 10^-5 J