$16.$ Which of the following sentences contains at least one error?

a$.$ Mike was always willing to provide training to other team members, answer any questions they may have, and get them up to speed.

b$.$ In order to help new hires acclimate to the organization, a new employee manual was created and new employee orientation was held every six months.

c$.$ While Derek preferred working nights, he was forced to temporarily shift his schedule in order to attend the one$-$month training being offered during standard business hours.

d$.$ When her boss critisized her habitual tardiness, Janine retorted with excuses that were neither reasonable nor accepted.