The substantives showed like options to answer are <em>"corte, dolor and cicatriz"</em> which translate in English <em>cut, pain, and scar, </em>each one of these have a possible undetermined article, which could be:
- <u>Un</u> corte.
- <u>Un</u> dolor.
- <u>Una</u> cicatriz.
How the one substantive that can use the article <em>"una"</em> (the same that is in the sentence) is <em>cicatriz</em>, this is the reason for selecting it.