Simplify the Expression $10 ^ { \log ( 1 / 7 ) }$

Simplify the expression.
- $10 ^ { \log ( 1 / 7 ) }$

A) $\frac { 10 } { 7 }$
B) $10 ^ { 1 / 7 }$
C) $\frac { 1 } { 7 }$
D) $\log \frac { 1 } { 7 }$