You are given a paragraph (Passage), a question (Question) and two answer options (Option1 and Option2). Your task is to choose the correct answer to the question based on the passage. Answer of the question cannot be found directly from the passage, it is indirectly indicated in the passage. Do not answer with words other than the two options, and do not answer with option titles(e.g. "option1" or "1" are not acceptable answers.)

Passage: This morning I got out of bed and saw what a mess it was . The first thing I needed to do was pull the blanket off . I put the bottom sheet 's elastic corners back on all four corners of the bed . After I got that fixed , I straightened out the flat sheet , pulled it across the whole bed and tucked the bottom of it between the mattress and box springs . I pulled the flat sheet up at the top of the bed and made it smooth . Then I put my pillow back inside its case . I shook it down into the case and placed it at the top of the bed . I stepped back and glanced at my nicely made bed . Question: What part of the flat sheet did they place under the mattress? Option1: The bottom sheet Option2: The top sheet
The bottom sheet