Solve Write the Answer in Simplest Form $\frac { 5 } { 7 } \text { of } 42$

Solve. Write the answer in simplest form.
-Find $\frac { 5 } { 7 } \text { of } 42$

A) $\frac { 5 } { 294 }$
B) 30
C) 42
D) $\frac { 294 } { 5 }$