Evaluate the Cylindrical Coordinate Integral $\int _ { 0 } ^ { \pi } \int _ { 0 } ^ { 2 } \int _ { 0 } ^ { 4 / r } \sin \theta d z r d r d \theta$

Multiple Choice

Evaluate the cylindrical coordinate integral.
- $\int _ { 0 } ^ { \pi } \int _ { 0 } ^ { 2 } \int _ { 0 } ^ { 4 / r } \sin \theta d z r d r d \theta$

A) $24 \pi$
B) 24
C) 16
D) $8 \pi$