What are the purposes of a public service campaign? select three options.

to guide or alter behaviors

to influence public opinion

to sell a product or service

to raise awareness about an issue

to determine the public’s preferences

to gain votes for a particular candidate

some purposes of public service campaigns is one to raise awerness to issues going on because when people use their voice they can be heard and raise awerness to what they think is right

Explanation:

to raise awareness about an issue

to influence public opinion

to guide or alter behaviors

Explanation:

your answer is c) experiments with water vapor showed that elements combine in specific proportions.