Evaluate the Expression $$- \left( \frac { 9 } { 49 } \right) ^ { 1 / 2 }$$

Multiple Choice

Evaluate the expression.
- $$- \left( \frac { 9 } { 49 } \right) ^ { 1 / 2 }$$

A) $- \frac { 9 } { 98 }$
B) $\frac { 7 } { 3 }$
C) $- \frac { 3 } { 7 }$
D) not a real number