The correct answer would be the following:
The Agency that would deal with Casey's loan rejection questions would be the Fair Credit Reporting Act, which is a federal government legislation created to promote fairness regarding consumer's information.
The Agency that would deal with shoppers finding out that their breakfast cereal was contaminated would be the Food and Drug Administration, which is a federal agency responsible to protect public health of American citizens by regulating the food and drug products sold in the country.
The Agency that would deal with John being pestered by telemarketers would be the Federal Communications Commission which is a federal agency that regulates all forms of telecommunications within the country.