If hes just being rude, honestly just stay in your room or something until he leaves, or maybe even tell your brother about it so maybe he'll say something to the friend. if he keeps bothering you even after all that, just tell him to leave you the FU€K alone. best of luck!!
Answer:
Why pay so little attention to physical activities
The answer is C as it is said at the start of the introductory paragraph I hope this helps