In fact, the answer to this question is only to divide the quotation in the bond market by the conversion factor to see who has less value, because the conversion factor in bond trading is actually a form of converting different types of bonds into a unified number of standard bonds. Note that the figures after the integer in these national debt quotations actually represent how many thirtieth, for example,-16 actually represents 16/32, which is 0.5.

According to the known conditions of the topic:

A bond =99.5/ 1.0382=95.84.

B bond =118.5/1.2408 = 95.5.

C bond =119.75/1.2615 = 94.93.

D bond =143.5/1.5188 = 94.48.

Because the calculated value is the smallest d, d is selected.