Solve the Equation $$\sqrt { 4 m ^ { 2 } + 2 m + 6 } = - 2 m$$

Solve the equation. $$\sqrt { 4 m ^ { 2 } + 2 m + 6 } = - 2 m$$

A) m = 6
B) m = ±3
C) m = -3
D) m = -6
E) no solution