Answer:
The correct answer is:
Uncertainty
Step-by-step explanation:
Going from keeping manual records of subscriptions and issues, to keeping the same records in a software system is a radical operating change that can cause uncertainty to the workers.
The workers may feel doubts about their ability to adapt to the software (even if it's described as easy to use), and they may even fear that the software itself will replace them, causing them to lose their jobs. All these feelings can be summarized under the term "uncertainty".