What kind of polls might journalists use to assess how voting has gone during an election
The correct answer is letter C: Exit polls
During election time, some methods like opinion polls, surveys, questionnaires, phone, and online votes are useful ways of testing voters.
Journalists use to asses exit polls, that is to say, they ask voters for whom they voted in order to have early information of how an election has turned out (because an election can take a long time to count).
As a conclusion, exit polls give information on who won the election, explain the success, predict the future candidate by analyzing voter intent and behavior and cast demographic factors.