As Shown in the Figure,three Charges Are at the Vertices

As shown in the figure,three charges are at the vertices of an equilateral triangle.The charge Q is 6.7 nC,and all the other quantities are accurate to two significant figures.What is the magnitude of the net electric force exerted on the charge Q by the other two charges? (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

A) 2.1 × 10^-3 N
B) 1.2 × 10^-3 N
C) 1.0 × 10^-3 N
D) 1.4 × 10^-3 N