Three of the following statements are true. Which one is false?

a Not only the parties, but their heirs and assigns are bound by their contract.

bObligations arising from contracts have the force of law between the contacting parties and must be complied with in good faith.

c Fraud committed in the performance of an obligation gives the injured party the right to annul the contract.

dGenerally, the debtor is not liable for the non-performance of his obligation due to fortuitous event.

explain