Fill in the Blank to Make the Trinomial a Perfect $64 s ^ { 4 } + \underline { ( \quad ) }+ 81$

Multiple Choice

Fill in the blank to make the trinomial a perfect square trinomial. $64 s ^ { 4 } + \underline { ( \quad ) }+ 81$

A) $64 s ^ { 4 } + \underline { \left( 72 s ^ { 2 } \right) } + 81$
B) $64 s ^ { 4 } + \underline { \left( 144 s ^ { 2 } \right) } + 81$
C) $64 s ^ { 4 } + ( \underline { 144 s } ) + 81$
D) $64 s ^ { 4 } + { \left( 36 s ^ { 2 } \right) } + 81$