It should be (B). All that the experiment proves is that the butterflies are sensitive to electricity.
Why not C....
Must be B
Though I also chose C first but now I can see that C is wrong.
(B) monarch butterflies
are sensitive to electricity
(C) low-voltage electricity can affect butterflies
, whether positively or adversely
C is talking about butterflies in general but argument is talking about monarch butterflies.
SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008