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) ABC Co.buys all chemicals contained in a drum marked "A" but the price has to be ascertained by measuring the number of litres in the drum.
B) 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.
C) Mrs.Jones calls the Bay and asks it to send her the blanket advertised on page 3 of its flyer.The Bay agrees and takes her credit card number.
D) Mary picks out a leather briefcase and leaves it with the seller so that initials can be engraved on it.She pays by cheque.
E) 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 a sofa sent from its warehouse directly to Preston's home.