If the system of linear equations <br> $x+ ky + 3z=0$ <br> $3x + ky - 2z=0$ <br> $2x + 4y - 3z =0 $ <br> has a non-zero solution $(x, y, z)$, then $\frac{xz}{y^2}$ is equal to :

Question

( A ) $-10$
( B ) $10$
( C ) $30$
( D ) $-30$