Perform the Indicated Operation $\frac { 3 x } { 7 } \cdot \frac { 5 x } { 7 }$

Multiple Choice

Perform the indicated operation. Simplify if possible.
- $\frac { 3 x } { 7 } \cdot \frac { 5 x } { 7 }$

A) $\frac { 15 x } { 49 }$
B) $\frac { 15 x ^ { 2 } } { 7 }$
C) $\frac { 15 x ^ { 2 } } { 49 }$
D) $\frac { 8 x } { 7 }$