Name the air and electrical connections made between two C-3 cars of a push-pull train.

The correct answer highlights the essential air and electrical connections necessary for the operation of a push-pull train, particularly between two C-3 cars. In this context, the brake pipe and main reservoir connections are crucial for the braking system to function effectively. The brake pipe delivers compressed air that is used to apply the brakes, while the main reservoir is where air is stored for various systems, including the brakes, ensuring that there is a reliable supply of pressurized air for operation.

In a push-pull configuration, these connections are vital because they allow for consistent communication between the locomotives and the cars, ensuring that all brakes can be applied simultaneously and maintaining the train's ability to brake efficiently and safely under various operating conditions.

Other options may address different aspects of train operations but do not encompass both necessary air and electrical connections. Understanding the role of the brake pipe and main reservoir is fundamental for maintaining proper operation and safety in the push-pull train configuration.