Question

Carrie decides to offer Shelley the opportunity to purchase her motorcycle for just $500. Carrie told Jim, a mutual friend of Shelley and her, that she intended to make the offer. Later, Carrie changes her mind. Shelley approaches Carrie and says she accepts the offer. No contract was formed most likely because
A. Carrie never communicated the offer to Shelley.
B. Carrie didn't possess a serious, objective intention.
C. Jim was acting as an agent for Shelley without telling Carrie.
D. the terms of the offer weren't definite enough to form a contract.