Giải phương trình \(2{\sin ^2}x - 5\sin x + 2 = 0\).

A. \(\left[ \begin{array}{l}
x = \frac{\pi }{6} + k2\pi \\
x = \frac{{5\pi }}{6} + k2\pi 
\end{array} \right.,k \in Z\)

B. \(\left[ \begin{array}{l}
x = \frac{\pi }{3} + k2\pi \\
x = \frac{{2\pi }}{3} + k2\pi 
\end{array} \right.,k \in Z\)

C. \(\left[ \begin{array}{l}
x = \frac{\pi }{3} + k2\pi \\
x =  - \frac{\pi }{3} + k2\pi 
\end{array} \right.,k \in Z\)

D. \(\left[ \begin{array}{l}
x = \frac{\pi }{6} + k2\pi \\
x =  - \frac{\pi }{6} + k2\pi 
\end{array} \right.,k \in Z\)