Simplify Assume That All Variables Represent Any Real Number $\sqrt { x ^ { 2 } - 14 x + 49 }$

Multiple Choice

Simplify. Assume that all variables represent any real number.
- $\sqrt { x ^ { 2 } - 14 x + 49 }$

A) $- | x - 7 |$
B) $- x + 7$
C) $| x - 7 |$
D) $x - 7$