Fill in the Blank to Make the Trinomial a Perfect $81 t ^ { 2 } + \underline { ( \quad ) } + 16$

Multiple Choice

Fill in the blank to make the trinomial a perfect square trinomial. $81 t ^ { 2 } + \underline { ( \quad ) } + 16$

A) $81 t ^ { 2 } + \underline { ( 18 t ) } + 16$
B) $81 t ^ { 2 } +\underline { ( 72 t ) }+ 16$
C) $81 t ^ { 2 } +\underline { ( 36 t ) } + 16$
D) $81 t ^ { 2 } + ( 36 ) + 16$