Gus Gullable, a resident of Kansas and Ned Naive, a resident of Missouri, each purchased an $85,000 used aircraft in their home states from Slick Sam, Inc.("Slick Sam"), an aircraft broker incorporated in Delaware with a principal place of business in Kansas.Gullabe and Naive both sign their respective contracts with the words "signed at Wichita, Kansas."Both Gullible and Naive believe they were cheated by Slick Sam on the aircraft sales, and they would like to sue Slick Sam for fraud.Assuming that there is no federal question at issue, assessthe accuracy of the following statements, and state the rule of law for each statement and the result:

(a) Gullible can sue Slick Sam in a Kansas state trial court.

(b) Gullible can sue Slick Sam in a federal district court in Kansas.

(c) Naive can sue Slick Sam in a Missouri state trial court.

(d) Naive can sue Slick Sam in a federal district court in Missouri.