Denzel is one of $50,000$ people defrauded of $$40$ in an advertising scam. Denzel's best course of action to recover his money is to

a$)$ bring an individual lawsuit against the advertiser in a state appellate court.

b$)$ mediate the claim with the advertiser.

C$)$ bring an individual lawsuit in a U$.$S$.$ District Court.

d$)$ become part of a class action lawsuit, which could include plaintiffs who are unaware of the lawsuit or are unaware they were harmed.