@neha, square has side of 2 units, not 1
@komal,,
take the point that has been placed at the centre and take any of the points placed at the vertices. Now the distance between them is 1/root 2 < root 2. Isnt it? so we can find out atleast two points s.t the distance between them is less than root 2. so i think option c is correct.
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