Hello @cpa8488,
This is the reason although this is a very confusing and vague question, this is the reason why it is B.
1) In the question, it says that Bond and Spear orally AGREED that he would buy a car for spear for 475$. Contract has been formed between them already regardless of whether the 100$ was paid.
2) Option contract (where promisor promises to keep an OFFER open in exchange for consideration) does not apply here. Why? Because a contract has already been formed.
3) According to statute of frauds, certain contracts need to be in writing in order to be enforceable. Sale of GOODS contracts above $500 need to be in writing to be enforceable. However in this case, oral contract is fine because it is only $475 .
The question essentially tests whether we are aware of the rule regarding oral contracts of sale of goods under $500 being a valid contract.
Sorry if my explanation is bad. Let me know if you understand 🙂