Simplify Assume That All Variables Represent Positive Real Numbers $\sqrt{192}-3 \sqrt{48}-3 \sqrt{108}$

Multiple Choice

Simplify. Assume that all variables represent positive real numbers.
- $\sqrt{192}-3 \sqrt{48}-3 \sqrt{108}$

A) $36 \sqrt{3}$
B) $-22 \sqrt{3}$
C) $-48 \sqrt{3}$
D) $22 \sqrt{3}$