GMAT Critical Reasoning (CR) | Ethicist: In a recent judicial decision, a contractor was ordered to m

Ethicist: In a recent judicial decision, a contractor was ordered to make restitution to a company because of a bungled construction job, even though the company had signed a written agreement prior to entering into the contract that the contractor would not be financially liable should the task not be adequately performed. Thus, it was morally wrong for the company to change its mind and seek restitution.
Which one of the following principles, if valid, most helps to justify the ethicist’s reasoning?
(A)
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