How many electric jumper cables are there between a married pair of M-3 cars?

The correct choice indicates that there are 8 electric jumper cables between a married pair of M-3 cars. Each married pair, which refers to two M-3 cars connected together, has a specific number of electric jumper cables that facilitate various electrical functions essential for rail operations. These cables are responsible for the transmission of power and control signals between the cars, allowing for coordination in braking systems, interior lighting, and other electrical systems when the trains are in operation.

Having 8 jumper cables allows for a robust connection that supports the operational needs of the trains while ensuring efficient communication between the cars. This number strikes a balance between functionality and operational efficiency, as too few cables may lead to inadequate electrical support, while too many could unnecessarily complicate the connections and maintenance.

Understanding the number of jumper cables is essential for those working on or operating these trains, as it directly influences operational reliability and safety.