Add or Subtract $30 \sqrt{11}-12 \sqrt{11}$ A) $42 \sqrt{11}$ B) 198
C) 18
D)

Multiple Choice

Add or subtract. Simplify by collecting like radical terms, if possible.
- $30 \sqrt{11}-12 \sqrt{11}$

A) $42 \sqrt{11}$
B) 198
C) 18
D) $18 \sqrt{11}$