What Is the "Coattails Effect

What is the "coattails effect"?

A) all congressional candidates from one party running as a common partisan ticket
B) the impact on congressional elections of the popularity or lack of popularity of the president
C) the impact on elections of celebrity endorsements
D) the impact on presidential elections of the popularity or lack of popularity of the congressional party
E) a midterm election that occurs when the incumbent president is constitutionally prohibited from seeking reelection in the next presidential election.