Kelly's office has two doctors with very different work habits. Each has his own team of technicians who are used to the doctors' preferences and are comfortable with their routines. They basically do the same thing every day. When Kelly suggested training all the technicians to work with both doctors, the result was significant resistance. The technicians were concerned that they would no longer be able to perform their usual daily tasks. The primary source of their resistance was $\_\_\_\_\_\_\_\_.$

$1$ point

A$)$ increased ambiguity

B$)$ forced change of habit

C$)$ concern over personal loss

D$)$ loss of status and authority