The Gallup Poll Gained Famed Because of Which of the Following

The Gallup Poll gained famed because of which of the following reasons?

A) it was able to predict the outcome of a presidential election because it used quotas as a sampling technique.
B) it was able to tell poor people how they should vote in an election to receive the most beneficial tax advantages.
C) it conducted its research via listeners to a famous radio show at the time.
D) it used nonprobability sampling when others had not yet heard of this approach.