Add or Subtract the Radical Expressions as Indicated, If Possible $5 \sqrt { 3 a } - \sqrt { 27 a } - \sqrt { 48 a }$

Multiple Choice

Add or subtract the radical expressions as indicated, if possible. $5 \sqrt { 3 a } - \sqrt { 27 a } - \sqrt { 48 a }$

A) $- 2 \sqrt { 3 a }$
B) $5 \sqrt { 3 a } - 7 \sqrt { a }$
C) $- 20 \sqrt { 3 a }$
D) Cannot be simplified further