Final answer:
Technicians' resistance to training to work with different doctors stems from the discomfort of 'forced change of habit', as they fear losing efficiency in their accustomed routines.
Step-by-step explanation:
The primary source of resistance faced by Kelly Rae when she suggested training all the technicians to work with both doctors in the ophthalmology office is B) forced change of habit.
The technicians were comfortable and familiar with their daily routines, tailored to the specific work habits of the doctors they were accustomed to.
Having to switch between different doctors and adapt to varying preferences and routines disrupts their established work patterns, causing apprehension about their ability to efficiently perform their tasks under the new system.