In Which of the Following Will the Title to the Goods

In which of the following will the title to the goods pass to the buyer at the time of contract?

A) While at the Bay, Preston decides to buy the style of sofa he sees on display. He pays by cash and the store arranges to have one sent from its warehouse directly to Preston's home.
B) Mary picks out a leather briefcase and leaves it with the seller so that initials can be engraved on it. She pays by cheque.
C) Williams contracts for the desk he selected at Antiques Unlimited, and he arranges to have it delivered to his office tomorrow and to be paid for in one month.
D) Mrs. Jones calls the Bay and asks them to send out the blanket advertised on p. 3 of its flyer. The Bay agrees and takes her credit card number.
E) ABC Co. buys all the chemicals contained in a drum marked "A" but the price has to be ascertained by measuring the number of litres in the drum.