Add or Subtract $7 \sqrt{18}-6 \sqrt{98}$ A) $63 \sqrt{2}$ B) $21 \sqrt{2}$ C) $-21 \sqrt{2}$

Multiple Choice

Add or subtract. Simplify by collecting like radical terms, if possible.
- $7 \sqrt{18}-6 \sqrt{98}$

A) $63 \sqrt{2}$
B) $21 \sqrt{2}$
C) $-21 \sqrt{2}$
D) $-63 \sqrt{2}$