$\"\"$

\

The expression is $\"\"$ .

\

Substitute value of $\"\"$ in the above expression.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

The value of expression 23 is not a perfect square. $\"\"$

\

The expression is $\"\"$ .

\

Substitute value of $\"\"$ in the above expression.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

The value of expression 81 is a perfect square ( $\"\"$ ). $\"\"$

\

The expression is $\"\"$ .

\

Substitute value of $\"\"$ in the above expression.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

The value of expression 30 is not a perfect square. $\"\"$

\

The expression is $\"\"$ .

\

Substitute value of $\"\"$ in the above expression.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

The value of expression 50 is not a perfect square. $\"\"$

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The option B is correct answer.