Add or Subtract $\sqrt { 49 } + \sqrt { 720 } + \sqrt { 100 } + \sqrt { 405 }$

Multiple Choice

Add or subtract. Assume all variables represent positive real numbers.
- $\sqrt { 49 } + \sqrt { 720 } + \sqrt { 100 } + \sqrt { 405 }$

A) $\sqrt { 720 } + \sqrt { 405 } + 17$
B) $21 \sqrt { 5 } + \sqrt { 49 } + \sqrt { 100 }$
C) $225 \sqrt { 5 } + 17$
D) $21 \sqrt { 5 } + 17$