Read the paragraph. Rina hustled through the classroom door, found her assigned seat, and sat down. After a few greetings to her friends, she unzipped her bulging binder and began to sort through its pages. She unearthed dog-eared worksheets, highlighted notes, and dated projects; alas, last night’s homework was not in the World History section where she had hoped it would be. As the bell rang, Rina’s fruitless search continued.

Based on the evidence provided, readers can conclude that Rina is

unconcerned.
studious.
ambitious.
disorganized.