Correct Answer - Option 3 :
F > N
Let us check the options:
1)M > S → As M > N ≤ D = S, there is no definite relation between M and S. This is not definitely true.
2) S < U → As S < F > I < U, there is no definite relation between S and U. This is not definitely true.
3) F > N → N ≤ D = S < F →F > S =D ≥ N →F > N. This is definitely true.
4) F > M → As M > N ≤ D = S < F, there is no definite relation between F and M. This is not definitely true.
5) S ≥ M → As M > N ≤ D = S, there is no definite relation between S and M. This is not definitely true.
Hence, only F > N is definitely true
