I can't type the square sign, so consider * as replacement.
*m = 3m , if m is odd
*m = m/2 , if m is even
*9 = 3*9 (as 9 is odd) = 27
*6 = 6/2 (as 6 is even) = 3
=> *9 x *6 = 27 x 3 = 81
*27 = 3*27 (as 27 is odd) = 81 = *9 x * 6 , so this is our answer, D
For the rest of the options, the value is not equal to 81.
Thanks
Anshu
(Every mistake is a lesson learned )