Bill is cash basis calendar year taxpayer. Which of the following December items result in gross income or deductions for the current year?

a. Check received for December rent, 700 not deposited until January 4.

b. Check for 1,100 to pay Bill's state income taxes mailed December 28, cashed January 7.

c. Cash received in the amount of 500 for services to be rendered the following year.

d. Interest of 800 credited to Bill's account balance.

e. Check received for January rent, 700, deposited on January 9.

f. Charitable contribution of 300, charged on Bill's master card.

g. Bills totaling 2,000 sent for services rendered during the year, uncollected as of year-end.