The gross domestic product (GDP) of the United States is defined as the all, in a given period of time. 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. Calculo, a U. S. electronics company, produces a calculator at a plant in Indonesia on March 22, 2018. Calculo imports the calculator into the united States on May 27, 2018.
b. You chop down a cherry' tree on your property in California and make a dining room table in 2018. A similar table sells for $800 in a local furniture store.
c. Zippycar, a U. S. automobile company, produces a convertible at a manufacturing plant in Minneapolis on January 12, 2018. It sells the car at a dealership in Philadelphia on February 21, 2018.
d. Sofaland, a Swedish furniture company, produces a table at a plant in Virginia on December 12, 2018. It sells the table to a college student on December 30.
e. Treetopplers, a U. S. lumber company, produces wood at a plant in Oregon on September 6, 2018. It sells the wood to Buildit and Partners, a developer, for use in the production of a new house that will be built in the United States in 2018. (Note: Focus exclusively on whether production Of the wood increases GDP directly, and ignore the effect of production of the new house on GDP.)