What's the correct option (statistics)

In 1936 the magazine Literary Digest, incorrectly predicted that Alf Landon would defeat Franklin Roosevelt in the presidential election. They based their prediction on 2.4 million responses out of 10 million sample ballots they sent to their own subscribers, individuals in telephone directories, and lists of automobile owners. What type of bias might have caused this error? I. Nonresponse bias II. Voluntary response bias III. Undercoverage I only Il only I and ll only 1, ll, and Ill Il and ill