For purposes of determining gross income, which of the following is true? a. embezzlement proceeds are not included in the embezzler's gross income because the embezzler has an obligation to repay the owner. b. a mechanic completed repairs on an automobile during the year and collects money from the customer. the customer was not satisfied with the repairs and sued the mechanic for a refund. the mechanic can defer recognition of the income until the suit has been settled. c. a taxpayer who finds a wallet full of money is required to recognize income even though someone may eventually ask for the return of the money. d. all of these choices are false. e. all of these choices are true.