What Is the Definition of Supply

Multiple Choice

What is the definition of supply?  

A)  the amount of a good that producers want to sell at a particular price 
B)  the amount of a good that producers are willing and able to sell at each possible price, other things constant 
C)  the amount of a good that producers are willing to sell at each possible price, other things constant 
D)  the amount of a good that producers are willing and able to buy at each possible price, other things constant