Answer:
a. fear that they would be forced out of their habits
Step-by-step explanation:
In as much as the aim is for absences and vacations not to pose a problem in productivity, Joshua's employees still objected because they might one day be told not to go on vacations and not even be absent from work. Thus, this becomes a problem for them.
Therefore the fear that they would be forced out of their habits sets in and they object the proposal.