Select the incorrect statement regarding relevant revenues-relevant revenues differ between the alternatives being considered-past or future revenues may be relevant-relevant revenues must make a difference in the decision under consideration-relevant revenues are identified in the same way as relevant costs

The incorrect statement regarding relevant revenues is "past or future revenues may be relevant-"

Explanation:  

Relevant revenue is one that differ between the options that are relevant to a decision. If an income will be the same regardless of the option selected, the decision has no effect on the income.

So The relevant revenue is future.

A past income has already happened and will be the same regardless of the decision that is made, therefore it is not relevant when making a decision.

there was no passage listed but using the process of elimination i'd say it was d. the high economy would do the opposite. i don't see how low prices would affect it. high unemployment is possible but i feel d is the better answer.