Which of the Following Would Create an Express Warranty

Which of the following would create an express warranty?

A) A seller promising at the time of sale that he will repair any defects or problems for a year from the sale.
B) A seller showing the buyer a model and saying,"Yours will be just like this only blue instead of red."
C) A seller taking a sample from a bin and indicating the purchase will conform to the sample.
D) All of the above create warranties.
E) None of the above create warranties.