If $x=\tan 15^{\circ},y=cosec 75^{\circ}$ and $z=4 \sin 18^{\circ}$ then :

Question

\[\begin {array} {1 1} (a)\;x < y < z & \quad (b)\;y < z < x \\ (c)\;z < x < y & \quad (d)\;x < z < y \end {array}\]