Norah, who gives music lessons, is a calendar year taxpayer using the cash basis method of accounting. On October 1 of this year, she received $1,200 for a one-year contract beginning on that date to provide 10 lessons. She gave 6 lessons this year. How much should Norah include in income this year?
A) $0
B) $360
C) $720
D) $1,200
Answer: D