Chara Was Hired for a Position That Required Her to Quickly

Chara was hired for a position that required her to quickly assemble parts on an assembly line.Unfortunately,Chara has consistently had problems keeping up with the pace of the other workers,and the line often gets backed up at her station.The employer decided to demote Chara to a cleaning position where she will earn a lower wage.The union grieved the demotion,claiming that management did not show just cause,nor did they warn Chara that continued slowness would result in a demotion.What is the likely outcome of the grievance?

A) The employer will lose because it should have shown just cause.
B) The employer will win because a demotion related to competence is non-disciplinary and not subject to review by an arbitrator.
C) The employer will lose because whether a demotion or discharge is disciplinary or non-disciplinary,the employee deserves to be given a warning.
D) The employer will win because the employer has the right to make final decisions about hiring,firing,promotion,and demotion.
E) The employer will lose because Chara was not incompetent.