John approaches Scott and offers to sell him a bottle of much needed antibiotics for $200, and the bottle contains 50 pills. Answer BOTH questions below:

a. Scott says "no, I'll only pay $150". John says "ok, let's do it!" Scott pays John $150 and John hands Scott the bottle of antibiotics. Who makes the offer and who accepts the offer in this scenario, and how did you come to your conclusion?

b. John tells Scott that the pills are stolen. Scott accepts to pay the $200 but tells John he'll bring the money to him the next day. Scott doesn't show up to pay John, and John wants to file a lawsuit for breach of contract. Can John enforce the contract, and why or why not?