In the Context of Seniority in a Unionized Workplace

In the context of seniority in a unionized workplace,

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