Calculate the Derivative $\frac { d } { d x } [ \sin ( 7 x ) ] ^ { 0.5 }$

Multiple Choice

Calculate the derivative. $\frac { d } { d x } [ \sin ( 7 x ) ] ^ { 0.5 }$

A) $3.5 \sin ( 7 x ) \cdot \cos ( 7 x )$
B) $3.5 ( \sin ( 7 x ) ) ^ { - 0.5 } \cdot \cos ( 7 x )$
C) $( \sin ( 7 x ) ) ^ { - 0.5 } \cdot \cos ( 7 x )$
D) $7 ( \sin ( 7 x ) ) ^ { - 0.5 } \cdot \cos ( 7 x )$
E) $7 ( \sin ( 7 x ) ) ^ { 0.5 } \cdot \cos ( 7 x )$