Rewrite the Expression in Terms of Exponentials and Simplify the Results

Multiple Choice

Rewrite the expression in terms of exponentials and simplify the results.
- $\sinh ( 2 \ln 7 x )$

A) $14 x$
B) $\frac { 1 } { 2 } \left( 49 x ^ { 2 } - \frac { 1 } { 49 x ^ { 2 } } \right)$
C) $\frac { 1 } { 2 } \left( 49 x ^ { 2 } + \frac { 1 } { 49 x ^ { 2 } } \right)$
D) $\frac { 7 } { 2 } \left( x - \frac { 1 } { x } \right)$