it's superlative that's the answer
C. because it is a side comment that they like the restaurant best, it is not part of the actual statement. Which is "The restaurant is open 14 hours a day"
<span><span>"he heard the slap of the window curtains
against the wall and the sound of paper fluttering from his desk,
and he had to push to close the door." quoted from the book</span></span>