Final answer:
A voidable contract allows parties to cancel their obligations. If avoided, both parties are released, treating the contract as nonexistent.
Step-by-step explanation:
When Saul claims that his contract with Teri for piano lessons is voidable, and if their contract is indeed avoided, the correct answer is A) both parties are released from it.
A voidable contract is one where one or more parties have the legal right to cancel their contractual obligations. If a contract is avoided, it effectively means that the contract is treated as if it never existed, releasing both parties from any obligations they may have had under it.
This would not include any other options such as insisting on performance (B), postponing obligations (C), or preventing the parties from entering another contract on the same subject (D).