Simplify the Expression $\sqrt { 245 x ^ { 2 } }$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $\sqrt { 245 x ^ { 2 } }$

A) $245 x$
B) $7 \times \sqrt { 5 }$
C) $5 x ^ { 2 } \sqrt { 7 }$
D) $7 \sqrt { 5 x }$