Other Things Constant, Which of the Following Would Shift the Supply

Other things constant, which of the following would shift the supply curve of a good to the left?

A) an increase in the price of that good
B) a decrease in the price of an alternative good
C) an improvement in technology used in producing the good
D) an increase in the cost of an important resource used to produce the good
E) an increase in the number of producers of the good