What action should be taken if a customer's offer to purchase a vehicle is accepted?

Answer: B — The offer becomes legally binding

If the customer's offer to purchase a vehicle is accepted, the offer becomes a legally binding contract between the customer and the dealer. This means that both parties are now legally obligated to fulfill their end of the agreement. Option C, stating that the vehicle's price is non-negotiable, is incorrect because the price can still be negotiated until a legally binding contract is formed. Option A, stating that the dealer must provide a written acceptance, is incorrect because an acceptance can be given verbally or through actions. Option D, stating that the customer must immediately provide full payment, is incorrect because the terms of payment can be negotiated and agreed upon between both parties before the contract is formed. Ultimately, the correct option is B because it accurately reflects the legal implication of a customer's offer being accepted.