Which Statement Explains the Relationship Between Price and the Quantity

Multiple Choice

Which statement explains the relationship between price and the quantity supplied?  

A)  When expanding output, firms will incur greater total costs. 
B)  As the price of a commodity falls, producers will find it more profitable to use higher-priced inputs in their production process. 
C)  As a result of rising production costs, firms can increase profits by expanding output only if the price of output increases. 
D)  To expand output, firms must hire more resources, which are always of poorer quality.