Based on Survey Data,Ronald Reagan's Campaign Staff Erroneously Concluded That

Based on survey data,Ronald Reagan's campaign staff erroneously concluded that he had a comfortable lead over his Democratic challenger,Walter Mondale,except on Friday nights.They were relieved to learn that these Friday results came about because

A) of the relationship between party membership and income,yielding a biased sample.
B) pollsters were unable to reach people at home on Friday nights,yielding very small samples.
C) most respondents had been partying,and didn't understand the survey questions.
D) most respondents resented the Friday night intrusion and lied about their preferences.