In 1936,the News Magazine Literary Digest Obtained the Opinions of Over

Multiple Choice

In 1936,the news magazine Literary Digest obtained the opinions of over two million Americans regarding the presidential election.The results suggested that Landon would win in a landslide over Franklin D.Roosevelt.A few weeks later,FDR won in a landslide.The results of the survey were not valid,and this was due to

A) a lack of random assignment.
B) a sampling bias.
C) poor wording of questions' variables.
D) a lack of experimental control.