Which of the Following Is a Solution to the Given $2 \cos x - 1 = 0$

Multiple Choice

Which of the following is a solution to the given equation?
$2 \cos x - 1 = 0$

A) $x = \frac { 7 \pi } { 4 }$
B) $x = \frac { \pi } { 6 }$
C) $x = \frac { 7 \pi } { 6 }$
D) $x = \frac { 5 \pi } { 3 }$
E) $x = \frac { 3 \pi } { 4 }$