Hillary is a cash-basis calendar-year taxpayer. during the last week of december she received a letter containing a $5,000 check for services. which of the following is a true statement? a. hillary is taxed on the $5,000 of service income in the year she cashes the check. b. hillary is taxed on the $5,000 of service income in the year the check was mailed. c. hillary is taxed on the $5,000 of service income in the year she receives the check. d. hillary is taxed on the $5,000 of service income in the year she provides the services. e. none of these is true.