Which Statement Describes an End User Adoption Barrier

Which statement describes an end user adoption barrier?

A) There are insufficient licenses for additional staff from a newly acquired company to use the solution.
B) The CIO insists on conducting training for all heads of department before deploying the new Collaboration solution.
C) The budget is insufficient to implement the solution for a new branch of the business.
D) Staff refuses to change their habits and continues to use a noncompliant social media application to conduct business communications.