An owner offered his home to a buyer for $100,000 cash. The buyer paid the owner $100 cash to keep the offer open for two weeks. The owner accepted the $100. Ten days later, the owner notified the buyer that he was withdrawing his home from the sale. The next day the buyer tendered $100,000 cash to the owner. Under these conditions:

a. the offer to sell was binding.
b. seller violated the agreement to hold open the offer to sell, but did not have to sell to the buyer because the buyer had not promised in his original conversation to buy the property.
c. seller rescinded, voiding the transaction.
d. although the seller violated the agreement, he effectively prevented a binding contract from forming by withdrawing his property from the market.