Answer:
a=243 square inches.
Option D is correct.
Explanation:
Let 's' denote the side of a square.
We are given the side of a square is three raised to the five halves power inches i.e.

Now Let the area of square be denoted by 'a'.
Then as we know that the area of square is given by:

Hence,

Hence, the area of square is 243 square inches.
Hence, option D is correct.