Correct option is C
A perfect square is a number that can be expressed as the square of an integer. The square of any integer always ends with one of the digits: 0, 1, 4, 5, 6, or 9.
The digits 2, 3, 7, or 8 can never appear as the unit digit of a perfect square because no integer squared ends with these digits.
Thus, the digit 3 can never be at the unit's place of a perfect square number.
