If in the short-run commodity X and commodity Y are supplied jointly, which of the following is correct?

• A An increase in demand for X will increase the supply of Y
• B An increase in demand for X will shift the supply of Y
• C An increase in demand for Y will raise the price of X
• D An increase in demand for X will cause less of Y to be produced
• E A probable tax on Y will cause more of X to be supplied