The Significant Aspects of the Steelworkers Trilogy Cases Did Not

The significant aspects of the Steelworkers Trilogy cases did not contain which of the following?

A) Interpretation of the agreement is for the arbitrator, not the courts.
B) The courts should not weigh the merits of a grievance when the contract calls for an arbitrator to do so.
C) The arbitrator's source of law is limited to the expressed provisions of the contract.
D) Industry practice is part of the agreement, although not expressed in it.