B. Teen fathers often do not finish high school
Television, advertisement and the political media are the three key elements from “Changing public opinion”.
<h3>What factors change public opinion?</h3>
Public opinion can be greatly influenced by public relations and the political media. Mass media also utilizes a variety of advertising techniques in order to get their message to the public and change the thoughts of people. Television is the main medium for molding public opinion and thoughts because huge number of people see television at their homes.
So we can conclude that Television, advertisement and the political media are the three key elements from “Changing public opinion”.
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I think it's B. Because if you're wearing something that filters oxygen (E.g. gas mask) and the substance becomes airborne, the filters in the protective gear might be overworked if the substance density is greater than the filtering capacity.