Explanation:

Statements:   Y < X < W ,      Y < I > L ,     C = F < L ,    S > D > C  
Conclusions:  W < I ,     S > F   ,    I > C
For conclusion I: W < I
From statements I and II, we get:
I > Y < W
Here, we get the opposite signs between W and I. Thus no relation can be established between them.
Hence conclusion I does not follow.
For conclusion II: S > F
From statements III and IV, we get:
S > C = F
Here, the common sign between S and F is '>'. Thus S > F.
Hence conclusion II follows.
For conclusion III: I > C
From statements II and III, we get:
I > L > C = F
Here, the common sign between I and C is '>'. Thus I > C.
Hence conclusion III follows.
Since only conclusions II and III follow.