Solve the Following Equation $\cos ^ { 2 } x + \cos x = 0$

Multiple Choice

Solve the following equation.​ $\cos ^ { 2 } x + \cos x = 0$ ​

A) ​ $x = \frac { 3 \pi } { 4 } + n \pi \text { and } x = \frac { 5 \pi } { 4 } + n \pi$ ,where n is an integer
B) ​ $x = \pi + 2 n \pi \text { and } x = \frac { \pi } { 2 } + n \pi$ ,where n is an integer
C) ​ $x = \frac { 3 \pi } { 4 } + 2 n \pi \text { and } x = \frac { 5 \pi } { 4 } + 2 n \pi$ ,where n is an integer
D) ​ $x = n \pi \text { and } x = \frac { 3 \pi } { 2 } + n \pi$ ,where n is an integer
E) ​ $x = \pi + n \pi \text { and } x = \frac { \pi } { 2 } + 2 n \pi$ ,where n is an integer