In this question , we should have a better understanding of squares.
Here we know that 70 x 70 = 4900 So in order to reach near about 5300 , we must look at squares of numbers near 70 like 71, 72 , 73
73 x 73 =5329
As we can see that 73 x 73 is the nearest perfect square which require addition of only 29 to make 5300 a perfect square
Hence option C is correct
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