Answer:
B. Class action
Step-by-step explanation:
In this scenario, Harvey is planning to file a case against a petrochemical giant that has a plant in his town because the petrochemical plant is dumping toxic wastes into its surrounding areas. Sequel to this, Harvey is mobilizing the residents of the town, all of whom have suffered from various health problems due to the activities of the plant.
Hence, a class action would be of most help to Harvey and the other residents.
In Law, a class action is a type of lawsuit in which a collective group of people (plaintiffs) having similar injuries or suffering similar damages caused by a particular company's product or action sue the defendant on behalf of a larger group. This simply means that, the group of people (plaintiffs) have a common interest as a result of sharing similar actions from an event.
Hence, the larger group that is being represented by Harvey is referred to as the "class" in business law.
Additionally, it is required by law that the class attest to the fact that they were affected by the actions of the petrochemical plant (defendant).