Three Identical $3.0 - \mu \mathrm { C }$ Charges Are Placed at the Vertices of an Equilateral Triangle

Three identical $3.0 - \mu \mathrm { C }$ charges are placed at the vertices of an equilateral triangle that measures 30 $\mathrm { cm }$ on a side. What is the magnitude of the electrostatic force on any one of the charges? $( k = 1 / 4 \pi$ $\varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 }$ )

A) $1.8 \mathrm {~N}$
B) $2.0 \mathrm {~N}$
C) $2.2 \mathrm {~N}$
D) $2.4 \mathrm {~N}$
E) $1.6 \mathrm {~N}$