Graduate buys house for parents

A 21-year-old girl named Fan Shibei, who graduated from Sichuan Normal University, wants to borrow 2,000,000 yuan to buy a house and insurance for her parents by asking for the funds online. She promised to pay the debt in 15 years and to spend the rest of her life with the creditor. The offer raised controversy on the Internet. She received some supporting comments online while also obtained unsolicited advice and criticism.

How many years did the girl promise to pay the debt?

A. 13 years

B. 14 years

C. 15 years