Suppose It Is 2020 and the Democratic Party Has Not

Suppose it is 2020 and the Democratic Party has not been able to sufficiently narrow down a pool of candidates. There are still five possible candidates that enjoy a relatively equal amount of support, as reflected in the primary and caucus results. How will the Democratic Party go about selecting a candidate for the presidency?

A) They will dismiss the delegates and ask states to conduct additional primaries.
B) They will broker a deal between the delegates and party officials.
C) They will release delegates from their pledged candidate and hold a convention vote.
D) They will base their decision on the candidate with the most money raised.