Based on this definition, indicate which of the following transactions will be included in (that is, directly increase) the GDP of the United States in 2018. a. Zippycar, a U. S. automobile company, produces a convertible at a manufacturing plant in Minneapolis on January 9, 2018. It sells the car at a dealership in Denver on February 24, 2018.
b. Rotato, a U. S. tire company, produces a set of tires at a plant in Michigan on September 13, 2018. It sells the set of tires to Speedmaster for use in the production of a two-door coupe that will be made in the United States in 2018.
c. An accountant starts a client's 2018 tax return on April 14, 2019, finishing it just before midnight on April 15, 2019.
d. Fastlane, a Japanese automobile company, produces a sedan at a plant in Indiana on December 5, 2018.