Answer:
The correct option is (c)
Step-by-step explanation:
A contract is treated valid when both the offeror and offeree agrees to the conditions in the contract. The acceptance could be written or expressed. the second condition of a valid contract is that something of value needs to be exchanged like money, goods or services.
In this case, Julius made an offer to purchase Rachel's boat. Rachel with no intention to sell, expressed acceptance to sell for $20,000 to which Julius agreed. This is a valid contract as Rachel accepted the offer for a consideration.