(30 points and brainlist)
kai began the research process by asking, “how does playing a musical instrument improve academic performance? ” now, he needs to modify his major research question as a result of his research. which question narrows the focus of his research?

a.
does playing piano improve the math scores of high school students?
b.
what is the relationship between music education and academic achievement?
c.
what is the connection between music and memory?
d.
does listening to classical music improve the thinking skills of children?