Step 1: Understand the casting processes.
- Hollow statues are typically made using Slush casting (II), where molten metal is poured into a mold and then slushed out to form hollow objects.
- Dentures are made using Investment casting (IV), a precision casting method often used for small, intricate parts.
- Aluminum alloy pistons are typically produced by Gravity die casting (I), which is suitable for casting metals like aluminum.
- Rocker arms are usually produced by Shell moulding (III), a casting process that provides good surface finish and dimensional accuracy.
Step 2: Conclusion
The correct matching is:
- (A) Hollow statues → (II) Slush casting
- (B) Dentures → (IV) Investment casting
- (C) Aluminum alloy pistons → (I) Gravity die casting
- (D) Rocker arms → (III) Shell moulding
Final Answer:
\[
\boxed{(A) (I), (B) (II), (C) (IV), (D) (III)}
\]