B, it reads well and sounds better
Students should be agents of cleanliness since it is everyone's responsibility to clean the surroundings and not depend on any one else to clean somebody's mess. Students who learn to clean the surroundings grow responsibly and apply this nature to daily lives when they grow old.
I agree but what does that got to do with anything<span />
Answer:
A)
how does music affect the brain
it is giving a more clear idea of what the primary question was asking and it just makes sense