Yes it is a phrase. .....
Answer: I believe the right answer to be the third option: to urge people to take action on an important issue
Explanation:
The most common topics of public service advertisement are health and safety. The purpose of such ads is to inform the general audience about matters that usually require some change in behavior. For instance, decades ago, it was common for Brazilian television channels to run an ad about cholera. The ad instructed people to wash their hands after using the toilet and before eating, as well as washing vegetables thoroughly before cosuming them. The purpose was to prevent cholera from spreading by educating people so that they would change their behavior.
