Copper corporation, a c corporation, had gross receipts of $25 million in 2015, $26 million in 2016, and $23 million in 2017. gold corporation, a personal service corporation (psc), had gross receipts of $24 million in 2015, $27 million in 2016, and $25 million in 2017. which of the corporations will be allowed to use the cash method of accounting in 2018? a. copper corporation only. b. gold corporation only. c. both copper corporation and gold corporation. d. neither copper corporation nor gold corporation. e. none of the above.