The selection of the vice presidential nominee at the nation convention is based on
A. The results of the primaries and caucuses: the candidate who places second in these contests in nominated as the running-mate of the candidate who finishes first
B. The convention delegates' judgement as to the candidate who would make the best vice president
C. The results of public opinion polls taken just before the convention begins
D. The presidential nominee's choice of a running mate
E. None of the above
Answer: D