Two Charges Q₁ = +6 $\mu$ C) and Q₂ = -2 $\mu$

Two charges Q₁ = +6 $\mu$ C) and Q₂ = -2 $\mu$ C) are brought from infinity to positions on the x-axis of x = -4 cm and x = +4 cm, respectively. How much work was done in bringing the charges together?

A) -1.80 × 10⁶ J
B) -9.00 × 10⁵ J
C) -16.9 J
D) -1.35 J
E) None of the above.