Jack and Ben each win K dollars prize at a contest. Jack invests her prize in a bank account that earns interest at a rate i^(2)= 12.49649%. Ben invests his prize in a bank account earning interests at a rate d^(n)=6%. It will take 2t years for the value of Ben's prize to reach the value of Jack's prize after t years. What is n?

a. 2

b. 3

c. 4

d. 6

e. 12