Simplify the Expression $2 \sqrt { 3 } - 9 \sqrt { 27 }$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $2 \sqrt { 3 } - 9 \sqrt { 27 }$

A) $- 29 \sqrt { 3 }$
B) $25 \sqrt { 3 }$
C) $- 7 \sqrt { 3 }$
D) $- 25 \sqrt { 3 }$