In 1936,the Newsmagazine Literary Digest Obtained the Opinions of Over

Multiple Choice

In 1936,the newsmagazine Literary Digest obtained the opinions of over two million Americans regarding the presidential candidates prior to the election.Among the more than 2 million returns,Alf Landon won by an overwhelming majority over Franklin Roosevelt. A few weeks later,Roosevelt won the real election by a landslide.The results of the survey were not valid due to:

A) an unrepresentative sample.
B) poor wording of questions' variables.
C) a lack of experimental control.