Bob Collects Baseball Cards and Decides to Sell a Few

Multiple Choice

Bob collects baseball cards and decides to sell a few of them on eBay.Some of the cards he wants to sell are rare and very valuable.What condition is necessary for an exchange to occur between Barry and a buyer?

A) His card should have a certificate of authenticity.
B) The opening bid must be lower than other cards being sold on the site.
C) Buyers must provide payment before the item is shipped.
D) Delivery must take place within 2 days of the purchase.
E) Potential buyers must be able to see the card and understand its qualities.