which material is typically used as a thermal insulator?\ncopper\nfoam\nceramic\naluminum

Answer:

B. foam

Brief Explanations:

Foam has low - density and air - filled cells which impede heat transfer, making it a good thermal insulator. Copper and aluminum are good conductors of heat. Ceramics can have some insulating properties but are not as commonly used as foam for general thermal insulation.