Which electrical source provides power to the right DCMP?

The correct choice for the source that provides power to the right DCMP is the right generator. The right generator is specifically designed to supply electrical power to the systems and components associated with the right side of the aircraft, including the right DCMP (Direct Current Motor Power) system. Each generator's main function is to ensure that its corresponding side of the aircraft receives the necessary electrical power for operations.

While battery packs and auxiliary power units serve critical roles in providing power, their usage is typically supplementary or for emergency backup rather than the primary source of regular operational power for specific systems like the right DCMP. The left generator would primarily serve the left side systems and would not directly supply power to the right DCMP. Thus, the right generator is the most appropriate answer as it aligns directly with the functional requirements for the right DCMP's power supply.