During the presidential election, Vernon tends to focus only on the news reports that support his view that one candidate is better than the other. He doesn't even read any articles that have a headline casting doubts on his preferred candidate. Vernon is demonstrating the bias.

 Confirmation

Explanation:

Confirmation  bias is the tendency of a person to believe the information, fact or any other matter which favors their pre-existing beliefs. This strengthens personal thought and ideas of a person as they rely on data that confirms their personal view.It is sort of cognitive bias practice.

According to the question, Vernon is depicting confirmation bias in which is only interested in the news reports that confirms and favors his beliefs in election and ignores other doubting information about candidates.

answer; randomized controlled trials;

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