The correct answer is: C. relevant revenues.
Relevant revenues are revenues that are affected by a decision. In this case, the decision is whether to take an unconventional course of action. The expected future revenue that diverges in unconventional course of action is relevant to this decision because it is affected by the decision.
Partial revenue is not the correct answer because it refers to revenue that is not the total revenue. Total revenue is not the correct answer because it refers to all revenue, regardless of whether it is affected by a decision. Irrelevant revenues is not the correct answer because it refers to revenue that is not affected by a decision.