Which of the following cases is the best example of an instance of social contagion? a shopper notices a sign in the electronics store saying that supplies of a certain tablet are limited. the shopper decides to buy the tablet based on this information. a politician gives a very moving speech in which he argues that the nation is superior to all other nations. the crowd cheers very loudly. a teacher in a school smells gasoline and begins to feel nauseous; soon most of the school's population is also feeling nauseous. later, it is discovered that there was never a gas leak. a person is suffering from a severe injury on the side of the road. however, people driving by fail to stop to even though they notice the injured person.

The answer is: A teacher in a school smells gasoline and begins to feel nauseous; soon most of the schools population is also feeling nauseous. Later, it is discovered that there was never a gas leak.

Social contagion refer to a social phenomenon when the behavior that displayed by a certain individual create a chain of reaction that make other people around him/her start to display the same behavior . (such as when the students mimic the nauseous behavior after they observe their teacher did it)

Social contagion tend to have a stronger effect if the person who initiate the contagious behavior is in the position of authority/importance (such the teachers in school environment or Actors in film set)

A) people, households, or businesses who are exposed to a media vehicle or message schedule at least once during a given time period.

Explanation: In advertising, reach is the number of people who are exposed to a given medium during an advertising schedule. This differs from the number of people the advertising needs reach to actually achieve a given goal. This is known as effective reach. For example when running an advertisement on a television channel, the reach is the total number of people or households who are exposed to the channel at least once in any specific time period.

This is useful in calculating the effective reach.