Which of the following are the rotating components in a Roosa Master distributive injector pump?

The correct answer highlights the key rotating components found in a Roosa Master distributive injector pump, which are integral to its operation. The drive shaft connects the injector pump to the engine's power source, enabling it to receive the necessary input to function. The distributor rotor is crucial for directing the fuel under high pressure to the appropriate injectors at the right time, ensuring efficient fuel delivery into the combustion chamber. The transfer pump, also a rotating component, aids in moving fuel from the tank to the injector pump, maintaining the necessary flow and pressure.

These components work together in a coordinated manner to facilitate the timing and distribution of fuel into the engine, which is critical for optimal performance. The other options listed consist of components that serve different functions and do not directly pertain to the rotating components of a Roosa Master injector pump. For example, the parts listed in the other options include various non-rotating components or components related to other systems, whereas option A focuses specifically on those that rotate, emphasizing their role in the injector pump's operation.