In the Context of Seniority in a Unionized Workplace

In the context of seniority in a unionized workplace,

A) a person who voluntarily bumped into a lower job usually is entitled to return to the higher position if that position is reinstated
B) a non- competitive clause prevents junior employees from competing with senior employees for new positions regardless of a senior employee's competence.
C) a competitive clause means that all employees can compete equally on the basis of merit, regardless of seniority.
D) the law requires seniority to have the same effect on both lay- offs and promotions.
E) a junior employee cannot earn more than a senior employee.