Barbara is taking Biology 1 next year, and she and Joe agree that he will sell his used biology book to her for $25. They agree that payment and delivery will take place next week. After making his agreement with Barbara, Joe saw one of his friends, Tom, who also is taking Biology 1 next year. Tom agreed to pay $30 for the biology book, and Joe agreed. Barbara found out Joe sold the book to Tom from a reliable source before she had paid for the book and before Joe had delivered it to anyone.
a. Joe's offer to Barbara is revoked.
b. Joe has a contract with Tom, but not with Barbara.
c. Joe’s offer to Tom was invalid for a contract to be formed.
d. None of the above.
