Answer: C. Para
Sentence: Para sentarnos, usamos un sillón.
Translation: To sit down, we use an armchair.
Explanation: The preposition "<em><u>para</u></em>" indicates the utility, the destination or the use of something. In this sentence, <em><u>it indicates the use of an armchair</u></em>: We use an armchair to sit down.
<h2><em>Spymore</em></h2>