Evaluate the Iterated Integral $\int_{0}^{\frac{x}{2}}\int_{0} ^ {\frac{y}{7}}\int_{0} ^ {\frac{2}{y}} (3 sin y) dx dy dz$

Multiple Choice

Evaluate the iterated integral $\int_{0}^{\frac{x}{2}}\int_{0} ^ {\frac{y}{7}}\int_{0} ^ {\frac{2}{y}} (3 sin y) dx dy dz$

A) $\frac { 3 } { 14 }$
B) $\frac { 6 } { 7 }$
C) $\frac { 2 } { 7 } \pi$
D) $\frac { 3 } { 7 } \pi$
E) $\frac { 4 } { 7 }$