Please answer the question and give the process of calculation

A borrow takes out a 7-year interest-only mortgage loan for 500,000 with monthly payments. The first two years of the loan have a teaser rate of 2%, after that, the rate can reset annually with 2% annual and 6% lifetime caps. On the first reset date, the fully indexed rate is 5%. What would be the monthly payment in the third loan year?

A because of the increase rate cap, the monthly payment would not change

B 1,667

C 2,083

D 2,500