The Supreme Court's Gardner-Denver Decision

The Supreme Court's Gardner-Denver decision:

A) resulted in trial courts overturning discrimination grievances heard by the arbitrators.
B) contended that the arbitrator's expertise pertains to labor agreement interpretation and not to resolving federal civil rights laws.
C) applies only to "reverse-discrimination" grievances (white employees having more seniority who are denied a promotion filled by a minority employee, for example) .
D) all of these
E) none of these