Collector carl displays his beer can collection at the local swap meet. mary sees the collection and is interested in buying it. carl says he will sell the collection for $1,500. mary says she really likes the collection but is only willing to pay $1,000. which of the following is correct? a. mary's offer is an option contract and she cannot revoke the offer. b. mary's counteroffer terminates carl's offer of $1,500.c. neither offer is valid. who would ever pay $1,000 or $1,500 for a beer can collection? d. if carl rejects mary's counteroffer, she can still accept carl's offer of $1,500.