Read the primary question.
Is listening to music while studying helpful or harmful to learning?
Which would be the best secondary question for this topic?
O
How does music affect the brain?
What kinds of music do teachers play?
Is it important to study music education?
Should students listen to soft or loud music?

how does music affect the brain

Explanation: it is giving a more clear idea of what the primary question was asking and it just makes sense

to persuade readers which is answer c

when alex falls for the charming new boy at school, cole -- a handsome, funny, sports star who adores her - she can't believe she's finally found her soul who truly loves and understands her.  

at first, alex is blissfully happy. sure, cole seems a little jealous of her relationship with her close friend zack, but what guy would want his girlfriend spending all her time with another boy? as the months pass, though, alex can no longer ignore cole's small put-downs, pinches, or increasingly violent threats.  

as alex struggles to come to terms with the sweet boyfriend she fell in love with and the boyfriend whose "love" she no longer recognizes, she is forced to choose -- between her "true love" and herself.

explanation: