A comma is used primarily to indicate a pause in a sentence, but it serves several purposes beyond just creating a pause. Here's a breakdown of the options you provided:
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To create a pause: This is correct. Commas help clarify meaning by indicating natural pauses in the flow of a sentence.
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To end a sentence: This is incorrect. Commas do not end sentences; they are used to separate elements within a sentence. Periods, question marks, and exclamation marks are used to end sentences.
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To build suspense: This is not a primary function of a comma. While strategic pauses might create suspense in writing, the use of a comma is not specifically to build suspense.
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To change the subject: This is also incorrect. Commas can be used in certain situations to set off clauses or phrases, but they do not serve the specific purpose of changing the subject.
In summary, commas are primarily used to create pauses and clarify sentence structure rather than to end sentences, build suspense, or change subjects.