Answer: C) i’d hoped you’d be able to attend the party.
Explanation: A sentence is in the subjunctive mood when it expresses a possibility of a desire, not a fact. We use subjunctive mainly when we are talking about events that aren't certain to happen. From the given sentences the one that is an example of the subjunctive mood is "i'd hoped you'd be able to attend the party" when the speakers says "you'd be able" that is a possibility and also a desire, but it is uncertain, so it is in subjunctive mood.
