What originally prompted senator mccarthy to make his infamous speech claiming he held in his hand names of 205 known communists in the state department?

Which of these marketing methods henry ford sell the model t to many people who had never before owned a car? a) offering free maintenance on cars for a full year b) airing television commercials with memorable slogans c) advertising with the new communication outlets such as radio d) offering many different colors and models for buyers to choose from