Each of the following factors contributed to the presidential selection system we use today except

a-the 12th amendment
b-the election of 1800
c-the concern over succession
d-the rise of political parties

The correct answer is C-the concern over succession

Explanation:

Every four years inside the United States there is an election to choose the next president and it is held on the first Tuesday after the first Monday in November. And this came from the 12th Amendment, the election of 1800 and the rise of political parties. But the concern over succession is most likely to replace a president when he dies or is incapable to work.  

besides the fact that abraham lincoln abolished slavery, and greatly benefit black people, he had a heavy impact of the definition of what democracy was, and should be.