Let S, N, V, M represent the ages of Shyam, Nath, Varun, and Muneer respectively. Statement A gives: M>V and V>S, V>N. This means Varun is older than both Shyam and Nath, but younger than Muneer. From A alone, we know M>V>(S, N). We donโt know the order between S and N, so we canโt determine the youngest. Statement B gives: M is the oldest. This means M >V,M>S,M>N.Thisdoesnโthelpdeterminetheyoungest. Statement C gives: S>N. Shyam is older than Nath. Using A and B together: M>V>(S, N). B just confirms M is the oldest, which A already implies among these four if V is younger than M. Westill donโt know the order of S and N. Youngest could be S or N. Using B and C together: Mis oldest (M>S, M>N, M>V) and S>N. We donโt know how V compares to S and N. The youngest could be N or V. Using A and C together: From A, M>V>S and M>V>N. From C, S>N. Combining these gives M>V>S>N. Therefore, Nath (N) is the youngest. Statements A and C together are sufficient to determine the youngest. This matches option (4).