$\"\"$

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The values of $\"\"$ .

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Substitute values of $\"\"$ in the expression $\"\"$ .

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$\"\"$

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$\"\"$ .

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Substitute values of $\"\"$ in the expression $\"\"$ .

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$\"\"$

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$\"\"$ . $\"\"$

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Substitute values of $\"\"$ in the expression $\"\"$ .

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$\"\"$

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$\"\"$ .

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Substitute values of $\"\"$ in the expression $\"\"$ .

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$\"\"$

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$\"\"$ .

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The values of expressions are $\"\"$ .

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Observe the above all expression, the expression $\"\"$ has greatest value. $\"\"$

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The option C correct answer.