Which of the Following Investments Has the Highest Net Present

Which of the following investments has the highest net present value (NPV) ,given that the interest rate is 5.5%?

A) one that pays $250 at the end of each of the next four years
B) one that pays $500 at the end of next year and $500 in four years' time
C) one that pays $250 at the end of next year and $750 in four years' time
D) one that pays $200 at the end of next year,$200 at the end of the second year,and $300 at the end of the third and fourth years
E) one that pays $250 at the beginning of each year for the next four years.