Answer:
A. giving proper training
Step-by-step explanation:
A common issue in IT and change management is that employees create a barrier to change (implementing a new information system). Of course, everyone prefers to stay in their comfort zone, but most of the times it is essential to adopt changes effectively. so that the whole organization can progress.
Giving proper training is the answer, as their lack of confidence mainly originates from their own lack of confidence regarding the software know-how. When their self-esteem regarding the IS raises, they stop seeing it as a threat to their comfort zone and start seeing it as a tool that aids their work, the user confidence will increase.
Other answers are related to technical things that do not improve user confidence.