Solution
All the Options except 'C' are Perfect Square's. 8 is a Perfect cube
$$ 1) 7^{2} = 49 $$
$$ 2) 5^{2} =25 $$
$$ 3) 2^{3} =8 $$
$$ 4) 6^{2} = 36 $$
Hence option C is the Answer
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