Step 1: Understanding ABS.
ABS (Acrylonitrile Butadiene Styrene) is a copolymer made from the polymerization of acrylonitrile, butadiene, and styrene.
Step 2: Explanation of options.
- (B) ABS is a copolymer, not a homopolymer or a thermosetting polymer.
- (A) ABS is not a homopolymer because it is made from more than one monomer.
- (C) ABS is not a thermosetting polymer, which cannot be remolded once formed.
- (D) ABS is not a liquid crystal polymer.
Final Answer: \[ \boxed{\text{B) Copolymer}} \]