Answer: "if"
Explanation:
Signal words are referred to as the words that provide hints on what is expected to happen while one is reading.
The signal word that points to the problem in the passage is "if". From the text, we can see that Hughes knew that the meat that comes from a single cow could not make many people sick buy that the real danger was "if" the disease was passed to other cows.
If you link the options I can help, I read Night in school. Assuming that's the book you're referring to.
Explanation:
the singer ended the concert with her most popular song .
I think the correct answer from the choices listed above is the last option. The phrase in the sentence that reveals that meaning of the word impetuous would be "on the other hand". It signifies the opposite of what was being aforementioned. Hope this answers the question.