Which factor is most likely to lead to the incumbency advantage for a candidate?

Name: Which factor is most likely to lead to the incumbency advantage for a candidate?
Brand: Quizplus
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Question

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Gerrymandering, the practice of drawing electoral district boundaries to benefit a particular political party, can significantly enhance an incumbent's chances of reelection by creating districts that favor them, thus contributing to the incumbency advantage.

Which Factor Is Most Likely to Lead to the Incumbency