I believe the answer is urbanization, I'm not sure you should rely on my answer though.
Answer:
The (non-existing) communist threat.
Explanation:
The. Berlin Blockade (1948-1949) can be seen, in retrospect, as the start of the Cold War. The Sovjets blocked the Western sectors of Berlin as a protest to the introduction of the Deutsche Mark in Berlin. This event troubled the already tense relationship between the two world powers.
Now it must be said that from the beginning the wide-spread belief that the U.S.S.R and it´s communist comrades (Cuba) was going to complete what Hitler couldn´t manage, i.e. conquer the whole world, was, in retrospect, an absurd idea from the American side.
This by paranoia fueled belief - see for more information Eric Hobsbawm in <em>The Age of Extremes </em>- was shown clearly in the Truman Doctrine, the failed invasion in Cuba and the Cuban Missile Crisis, not to mention the Vietnam War in which several American presidents <em>¨tapped their way through a dense cloud of incomprehension, confusion and paranoia.¨ </em>Eric Hobsbawm
I would say that it influenced the public to be more aware of moms drinking while driving. This also could have influenced more mothers to be more aware of when or where they drink, and how it could effect others.
For the first question the answer is B the second question is A and the last is C