A decrease in the price of a productive resource will result in each of the following except a?

These are the choices. Please explain how u get answer.
A.downward shift in the average-cost curves for all products which use the resources.
B.increase in the quantities produced and sold of all products which use the resource.
C.rightward shift in the demand curves for all products which use the resource.
D.increase i the quantity demanded of this productive resource.

Answer:
A, B and D are all true.

A. Products that use the cheaper resources will obviously be cheaper to make.

B. A cheaper end product should result in increased sales.

D. By being cheaper, customers should want more of that resource.

I just can't give you a definite answer of C, because I'm not sure about the demand curves. Would they move left or right?
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