The Following Events Occurred Before the Goods or Parts of the Goods

The following events occurred before the goods or parts of the goods were lost or destroyed.In which case would the buyer suffer the loss?

A) Al picked out and contracted for a particular computer, and an additional component had to be installed before it was in deliverable state. It was installed, but Al had not been notified that it was ready.
B) George ordered a Pentium computer system with 4 megabytes of RAM and a 105 megabyte hard drive advertised by Kicks Computers.
C) Jaspers contracted for four standard-sized cupboards for the kitchen. The boards had been cut, but they had not been assembled.
D) Yates chose which of the desks he wanted and contracted for it, but he had agreed to pay and pick it up the next day.
E) Heinz contracted for all the corn in Silo A. The seller still had to weight the corn to determine the price.