Party Identification Is the Single Most Important Predictor of How

Party identification is the single most important predictor of how people decide to vote because ______.

A) voters are too unsophisticated to vote in any other fashion
B) it leads people toward prospective issue voting
C) as a benefit, being a partisan means the voter does not need to register to vote, which counteracts one of the costs of voting
D) it directly influences one's vote and indirectly colors the partisan's perceptions of issues and candidates
E) it leads people toward retrospective issue voting