The organisation which collects consumer complaints, stops unfair practices, and sues companies is Federal Trade Commission.
The Federal Trade Commission's Bureau of Consumer Protection aims at stopping unfair, deceptive and fraudulent business practices by collecting reports from consumers and conducting investigations.
It also files complaints against companies and people that break the law and develops rules to maintain a fair marketplace. It also educates people about their rights and responsibilities.
Therefore, the correct answer is (c) Federal Trade Commission.
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