Where are the demo kits located on the B737-800?

The demo kits on the B737-800 are specifically placed at G2 FWD face and G4 left-hand side to ensure they are easily accessible during safety demonstrations. This strategic location allows the cabin crew to effectively showcase the safety equipment to passengers during boarding or prior to takeoff. The placement at the G2 FWD face allows for quick access when starting safety briefings at the front of the cabin, while the G4 left-hand side position provides an additional, accessible point for crew members to retrieve these kits as needed.

In contrast, the other options do not accurately represent the actual locations of the demo kits. The mention of G4 right-hand side or only at R2 jumpseat area would not fulfill the requirements for passenger safety briefings. The kits must be stored in designated areas that are confirmed for safety and efficiency during flight operations, making B the correct answer.