Final answer:
The law of supply indicates that a higher price leads to a higher quantity supplied, so the correct statement is 'a) As prices rise, quantity supplied rises.'
Step-by-step explanation:
The law of supply is a fundamental principle in economics that describes how producers will behave in the marketplace in response to changes in price. It suggests a common relationship between price and quantity supplied: as prices rise, quantity supplied rises; conversely, as prices fall, quantity supplied falls, assuming all other variables are held constant. Therefore, the statement that best represents the law of supply is: 'a) As prices rise, quantity supplied rises.'