Price controls are usually enacted
a. as a means of raising revenue for public purposes.
b. when policymakers believe that the market price of a good or service is unfair to buyers or sellers.
c. when policymakers tax a good.
d. all of the above are correct.

Option (B)

Explanation:

Price controls are described as the restrictions which is set in the place and thus enforced by the federal governments, these are set up on prices which are charged for the commodities, goods and the services in the market. The sloe intent that lies behind enforcing such authority can born from desire in order to maintain the affordability of these commodity especially during the shortages, and also in order to slow the inflation.

what are the events?

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