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Bunuel
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C)41 as find the closest perfect square first which is 900, ie. The square of 30. Now check 31x31 which is 961. Therefore 961 is nearest to 920 in terms of being a greater number which is also a perfect square. Thus 41 is the correct answer.

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961,number next to the square of 30 (900) will be 31*31=961.
Answer should be 961-920 =41

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30^2 = 900
31^2 = 961

Since 920>900, the next perfect square greater than 920 is 31^2, which is 961.

Difference = 961-920 = 41
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