Todd,a Manager at Dexter Manufacturing,has Received a Grievance Filed by a Group

Todd,a manager at Dexter Manufacturing,has received a grievance filed by a group of his subordinates who are union members.
-Which of the following most likely indicates that filing a grievance is appropriate in this situation?

A) Dexter has recently downsized its workforce and outsourced many jobs overseas to save money.
B) The employees assert that Dexter failed to provide them with adequate personal protection equipment.
C) Each of the Dexter employees has recently received a warning for participating in unsafe acts while on the job.
D) The employees argue that the local union should not have used an arbitrator during contract negotiations with Dexter.