A buyer and seller reach an agreement via email, but the seller sends the contract by postal mail and it takes a week to arrive. What is the result for the buyer?

The agreement between the buyer and seller is generally considered valid and enforceable from the moment the parties have mutually agreed to the terms, which in this case occurred via email. However, the physical delivery of the contract can impact how the agreement is executed, particularly in terms of formalities.

Even though the seller sent the contract by postal mail and there is a delay in delivery, the fundamental principle in contract law is that once both parties have agreed to the terms (in this scenario, through email), the contract can be enforced. The actual enforcement of the contract does not hinge on the immediate receipt of the signed document but rather on the mutual consent that has been established.

In contract law, communications can sometimes be deemed as binding once sent, depending on the terms of the agreement and the method of communication used. Since the buyer and seller reached an agreement via email, the contract is enforceable even with the delay in receiving the physical contract. The buyer's acceptance via email indicates intent to be bound by the agreement, making option D the correct interpretation in this scenario.