Solve this:

Question No. 22 
What is the general solution of the equation (sin 2x+ 2 sin 4x + sin 6x = 0)? 

$$\begin{gathered} \left(\mathrm{A}\right) \mathrm{x}=\frac{\mathrm{m\pi }}{4}, \mathrm{m}\in \mathrm{Z} \\ \left(\mathrm{B}\right) \mathrm{x}=\frac{\mathrm{m\pi }}{2}, \mathrm{m}\in \mathrm{Z} \\ \left(\mathrm{C}\right) \mathrm{x}=\left(2\mathrm{m}+1\right)\frac{\mathrm{\pi }}{4}, \mathrm{m}\in \mathrm{Z} \\ \left(\mathrm{D}\right) \mathrm{x}=\left(2\mathrm{m}+1\right)\frac{\mathrm{\pi }}{2}, \mathrm{m}\in \mathrm{Z} \end{gathered}$$