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.
D. it clearly connects ideas
Parallelism is when the same grammatical or sentence structure is used for a list of ideas or items. By using a similar grammatical structure the reader's brain automatically makes a connection between the ideas because of the similar structure. Caesar's famous line "I came. I saw. I conquered." is an example of parallelism. Each of the sentences has the format subject-past tense verb.
