Step 1: Identify Carbon Content Ranges for Steels and Cast Irons - Hypo-eutectoid steel: Carbon content<0.8% (I)
- Hyper-eutectoid steel: 0.8%<Carbon content<2% (II)
- Hypo-eutectic cast iron: Carbon content<2.0% (III)
- Hyper-eutectic cast iron: Carbon content>2.0% (IV)
Step 2: Determine Correct Matches
The correct matches are:
- (A) Hypo-eutectoid steel → (I)
- (B) Hyper-eutectoid steel → (II)
- (C) Hypo-eutectic Cast Iron → (III)
- (D) Hyper-eutectic Cast Iron → (IV)
Final Answer: \[ \boxed{(A) (I), (B) (II), (C) (IV), (D) (III)}\]