Correct Answer - Option 4 : Amit
From the given information,
1) Sonu is taller than Yatendra, Amit is taller than Sonu.
So, Amit > Sonu > Yatendra
2) Subhash is taller than Amit. Sattu is tallest of all.
So, Sattu > Subhash > Amit > Sonu > Yatendra
Thus, clearly Amit is exactly in the middle.