In 2015, SN medical devices issued bonds with 30 years maturity, 10 years call protection, par value of $1000, call price of $1090, coupon rate of 6% and annual coupon payments. Today, year 2020, the bonds trade at a price of $1250. What is the yield to call if SN calls the bonds at the first possible opportunity?

a. 3.72%

b. 9.32%

c. 3.62%

d. 2.36%