The Era of Informal Polling Techniques Came to an End

The era of informal polling techniques came to an end and was replaced by more scientifically based systems

A) in the 1940 presidential election.
B) after a magazine in 1936 mistakenly predicted Alf Landon the winner over FDR.
C) when television began to play an increasingly important role in forecasting elections.
D) when advertisers decided that polling was useless for the purposes of marketing.
E) None of these