A violin in an empty station
Practice problem
The following text is from a fictional story. Every afternoon, Mira practiced the violin in the empty train station, where her notes echoed beneath the high glass roof. At first, the vast room had made her feel small, but now its echoes seemed to play alongside her. As Mira began another song, she smiled at how familiar the station had become.
Which choice best describes the function of the underlined sentence in the text as a whole?