Answer: I think it would be B.
I am sorry if I am wrong.
C.
the other two are songs from bands.
Baseball is our national pastime
1) B; the variety of drugs means this is a method for finding a general truth about drug sensitivity instead of about one specific drug
2) C; this is a proven statement from the study
3) B; this is a way the researchers determined the statement in question 2.
4) E; nerves aren't mentioned in the passage, so this is irrelevant information.
The last sentence: 5) C; this is something which was shown by the study