Question $4$

Which scenario would make a runoff primary most likely to occur?

There was a delay in processing voter registrations, and more than one$-$third of the eligible voters were unable to participate in the primary election.

One candidate participating in the primary process is accused of violating campaign finance rules, requiring that the primary elections be "rerun" through a runoff election.

Two candidates running for the Republican nomination for governor have similar sounding names that confused voters.

Six candidates are all running for the Democratic nomination for U$.$S$.$ Senate.