Final answer:
States that require all businesses to purchase workers' compensation insurance are known as Compulsory Insurance States.
Step-by-step explanation:
The correct answer is c) Compulsory Insurance States. States that require all businesses to purchase workers' compensation insurance are known as Compulsory Insurance States. In these states, it is mandatory for businesses to have this insurance to provide benefits to workers who suffer from work-related injuries or illnesses. Examples of Compulsory Insurance States include California, New York, and Texas.