A class action lawsuit is usually filed by a law firm on behalf of a large group of consumers

• A. A corporate internal complaint
• B. A government filing
• C. A single plaintiff case
• D. A law firm on behalf of a large group of consumers

Answer: (D)

Class actions bring together many people who have similar complaints against the same defendant so they can sue as a group. This is usually started by a plaintiff’s law firm that represents the group, with a named plaintiff acting as the class representative. The attorney files the case in court, and if the court certifies the class, the result binds all class members or governs their claims as a unit. This structure helps efficiently address widespread harm that individual lawsuits would be costly and repetitive to pursue.

That’s why the option describing a law firm filing on behalf of a large group of consumers is the best fit. It reflects how class actions are organized—private legal representation acting for many people with common issues. The other possibilities don’t match how class actions work: an internal corporate complaint isn’t a filed civil action by consumers, a government filing would come from a state or federal agency, and a single plaintiff case involves only one claimant without a representative group.