|A) an increase in price gives producers an incentive to supply a larger quantity.
|B) the quantity supplied of most goods and services increases over time.
|C) an increase in input prices increases supply.
|D) as more is produced, total cost of production falls.
Answer: A) an increase in price gives producers an incentive to supply a larger quantity.
The supply curve slopes upward because for reflecting the higher price needed to cover the higher marginal cost of production.