Why Is Walter Lippmann Credited with Spurring the Growth of Public

Why is Walter Lippmann credited with spurring the growth of public opinion polling?

A) Lippmann tried to predict the winner of the presidential contest between Andrew Jackson and John Quincy Adams.
B) Lippmann was a pioneer in the use of the straw poll.
C) Lippmann wrote a book in which he observed that research on public opinion was far too limited, especially in light of its importance
D) Lippmann discovered three fatal errors in the Literary Digest poll that wrongly predicted that Republican Alfred M. Landon would beat incumbent President Franklin D. Roosevelt.