According to the given information, 1) Suresh is taller than Nayan. Suresh > Nayan 2) Sameer is taller than Ankit and Mayank. Sameer > Ankit and Mayank 3) Mayank is taller than Suresh. Mayank > Suresh 4) Suresh is the 3rd tallest. _ > _ > Suresh > _ > _ 5) Nayan is not the smallest. By combining all the given information, we get the final arrangement: Sameer > Mayank > Suresh > Nayan > Ankit According to the above arrangement, The fourth tallest student is Nayan. Hence, "Nayan" is the correct answer