Answer: A) ...(ellipsis).
Explanation: An ellipsis ("...") is a punctuation mark that is formed for three dots, it has various uses, like, for example, omitting a part (word, sentence or even a paragraph) from a quote, but also ellipses can express hesitation or doubt an it can represent a pause in a sentence that, without the ellipsis, could be direct. In this case, a comma could work to make a short pause between the ideas of the sentence, but to show a long pause, the correct punctuation mark is the ellipsis.