A man saw his neighbor heading to the post office and asked the neighbor to mail a package for him as well. The neighbor did not know that the man's package contained heroin. Using the mail to send narcotics is illegal. Weeks later, the man learned that the neighbor needed money for a dental procedure. The man told the neighbor that he was going to give her $1,000 towards the dental procedure for "helping out with the package." Believing that she would have enough money with the extra $1,000, the neighbor then had the dental work done. However, the man never paid the neighbor the $1,000. The neighbor threatened to sue the man to enforce his promise to pay her $1,000. At that point, the man told the neighbor that the package had contained something illegal and argued that this would prevent any enforcement of his promise.

Which of the following statements is the most accurate?

Group of answer choices

The promise is potentially enforceable under a contract theory because the neighbor's act of taking the package to the post office provided valid consideration for the $1,000 promise.

The man's $1,000 promise is potentially enforceable under a theory of promissory estoppel because the neighbor fully performed her part of the transaction when she mailed the package.

The man's $1,000 promise is potentially enforceable under a theory of promissory estoppel because it was meant to and did induce the neighbor to get the dental work done.

The man's defense of illegality will prevent enforcement of the $1,000 promise under any theory because the neighbor engaged in criminal activity when she mailed the package.