Rút gọn (M = frac{1}{2}sqrt 5  - 3sqrt {20}  + frac{1}{3}sqrt {45} )

A. \(M =  - 4\sqrt 5 \)

B. \(M =  - \frac{9}{2}\sqrt 5 \)

C. \(M = \frac{3}{2}\sqrt 5 \)

D. \(M = \frac{13}{6}\sqrt 5 \)