The answer is C) "The Populist Party in American Politics."
Why is it C)? because this poster would be MOST helpful when writing a research paper entitled "The Populist Party in American Politics." Watson was a Populist from Georgia who, quite unsuccessfully, ran for the presidency in 1904. Though he was considered to be a friend of the farmer and the working man, Watson became known for both his belief in white supremacy and his anti-Catholic beliefs.