b. Anyone who is reasonable
Incorrect.
Let them ask a shaila
You missed the point. Many, if not most, people are unaware of the terms inside the sealed package (if not being entirely unaware that it is a “rental” in the first place.)
They are not asking for a reversal of the contract; the contract stipulated that under certain conditions, the CD must be returned.
Who cares what they are asking for. The only remedy Halacha entitles them, if there was a breach in the terms of the original contract, is to void the original contract. (The contract stipulation about being returned under certain conditions is not relevant to this breach of contract issue.)