How can an author change a mood by changing a setting?

Which is these is not a benefit of parallel structure? a)clarity b)classification c)emphasis d)balance

Which is the best example of manipulating an audience through media? a. playing sinister music while interviewing a celebrity b. criticizing a professional athlete without providing reasons c. starting a web form for a discussion about a new app d. filing a complaint against a company for its bad service

Respond for free points because i don't have a question anymore.