Simplify the Expression $\sqrt { 36 x ^ { 2 } }$

Multiple Choice

Simplify the expression. Assume that x is unrestricted and use absolute value symbols if necessary. $\sqrt { 36 x ^ { 2 } }$

A) 5x
B) $6 | x |$
C) 6x
D) 4x
E) $36 | x |$