The correct sentence is (A). In this example the author stablishes a good parallel structure when he/she enumerates the items. Commas must not be used in an independent clause; in particular, before a verb (the comma before “were” is not correct as an example B).
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<span>C) :
A colon here is right to set up the quote from the introduction in the sentence. The lead in shows that the writer is about to provide a specific example, not a quote that continues the flow of the sentence. A colon allows the quote to stand alone from the rest of the sentence as an example.</span>
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