How Does a Sale Differ from a Contract to Sell

How does a sale differ from a contract to sell?

A) Cash must change hands for a contract to sell to exist,but not for a sale to be completed.
B) The UCC defines a sale and a contract to sell as synonymous.
C) A sale is made when the salesperson makes an offer and receives unqualified acceptance,while a contract to sell exists only when the title passes from the seller to the buyer.
D) A contract to sell exists anytime a salesperson makes an offer and receives unqualified acceptance from the customer,while a sale is made only when the title passes from the seller to the buyer.
E) A sale is made as soon as a buyer agrees to a price,while a contract to sell exists as soon as a seller gives an offer.