If the Demand Increases for the Product of a Decreasing-Cost

If the demand increases for the product of a decreasing-cost industry:

A) short-run price goes up, but long-run price falls.
B) long-run output goes up, but long-run price may go up or down.
C) short-run output goes up, but long-run output may go up or down.
D) long-run output goes up, but short-run price remains constant.
E) long-run price goes up, but short-run price may go up or down.