Which One of the Following Would Shift the Supply Curve

Multiple Choice

Which one of the following would shift the supply curve for good X to the right?

A) The demand for goods in joint supply (e.g. by- products) goes down.
B) The costs of producing good X fall.
C) Good X now sells for a higher price.
D) The demand for good X rises.
E) The demand for alternative goods (i.e. which could be produced as an alternative to good X) goes up.