Add or Subtract the Radical Expressions as Indicated, If Possible $$\sqrt [ 6 ] { 7 x } + \sqrt [ 5 ] { 7 x }$$

Multiple Choice

Add or subtract the radical expressions as indicated, if possible. $$\sqrt [ 6 ] { 7 x } + \sqrt [ 5 ] { 7 x }$$

A) $\sqrt [ 11 ] { 7 x }$
B) $2 \sqrt [ 11 ] { 7 x }$
C) $\sqrt [ 11 ] { 14 x }$
D) Cannot be simplified further