Why did the first opinion poll on a presidential election—in Literary Digest in 1936—fail to predict the outcome?

Question

A.
The sample was too small.

B.
The sample was not random.***

C.
The sampling relied on landlines.

D.
The sampling was too early in the election year.

I believe it was biased (so thus B)

Answer 1

I agree.

Answer 2

yes B is correct