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.
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 Â Specialized vocabulary helps the speaker remember his or her main points is the appropriate answer.
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