State which court(s) have jurisdiction as to each of these lawsuits:

a. Pat wants to sue his next-door neighbor Dorothy, claiming that Dorothy promised to sell him the house next door.

b. Paula, who lives in New York City, wants to sue Dizzy Movie Theatres, whose principal place of business is Dallas. She claims that while she was in Texas on holiday, she was injured by their negligent maintenance of a stairway. She claims damages of $30,000.

c. Phil lives in Tennessee. He wants to sue Dick, who lives in Ohio. Phil claims that Dick agreed to sell him 3,000 acres of farmland in Ohio worth over $2 million.

d. Pete, incarcerated in a federal prison in Kansas, wants to sue the United States government.

He claims that his treatment by prison authorities violates three federal statutes.