We need to find the approximate value of $$\sqrt{4321} \approx$$ 65.73
We find that $$65^2=4225$$ < $$4321$$ and $$66^2=4356$$ > $$4321$$
So the least number to be added = 4356 - 4321 = 35
$$\therefore$$ 35 can be added to 4321 to make it a perfect square.
=> Ans - (E)
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