Which phrase does the author use to convey the ideas that the scientists' work was "treacherous"?

its c

explanation:

i have never seen this question what kind of test are you doing like for real wow

where is the sentence at?

are you kidding? from that description of two mansions, you can't figure out which one is bleak and desolate? maybe you should consider looking those words up in a dictionary, if you don't know what they mean already.