Speakers use specialized vocabulary related to a topic because it helps the speaker remember his or her main points. Thus, the correct answer is C.
<h3>What is Specialised Vocabulary?</h3>
Particular professions, like those in medicine or law, use specialised vocabularies. For particular words, they employ separate vocabularies or terminology for particular words,
Specialized vocabularies provide information on specialised terms and aid in context understanding.
Therefore, option C Specialized vocabulary helps the speaker remember his or her main points is the appropriate answer.
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The last sentence. All the others are incorrect with comma usage and/or terms of comparison.
They are saying that you should chose brand x over the other brands