Simplify (3sqrt{45}12sqrt{5}+16sqrt{20})leaving your answer in surd form

A.
(29sqrt{5}) 
B.
(14sqrt{15}) 
C.
(12sqrt{15}) 
D.
(11sqrt{5})
Correct Answer: Option A
Explanation
(3sqrt{45}12sqrt{5}+16sqrt{20}\
3sqrt{5times 9}12sqrt{5}+16sqrt{4times 5}\
3times 3sqrt{5}12sqrt{5}+16times 2sqrt{5}\
9sqrt{5}12sqrt{5}+32sqrt{5}\
29sqrt{5})