Repetitious. Those are synonyms, different words that have a similar or nearly identical meaning. Sullen and moody are adjectives that mean gloomy, morose, somber, resentful. Monotonous and repetitious are adjectives we use to signify that something is tedious, devoid of variations, dull.
Answer:
b. It adds credibility to the argument they wish to prove.
Explanation:
References from other sources adds credibility to a writers argument, especially when it comes from an expert source. References give an agrument more evidence and support and shows that they are people who agree with said agrument.
All of the other choices show a negative, or false effect of including a reference. Thus, the best option is b.
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