Collector Carl Displays His Beer Can Collection at the Local

Multiple Choice

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 counteroffer terminates Carl's offer of $1,500.
B) If Carl rejects Mary's counteroffer, she can still accept 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) Mary's offer is a firm offer. Carl has an exclusive right to consider her offer for a reasonable period of time.