Sentence 1: Katie has a big test in the morning. 
 Sentence 3: In order to prepare, Katie decided to pull an all-nighter 
 Sentence 4:  The next day, she went to class extremely tired 
 Sentence 5:  Luckily, Katie's teacher decided to postpone the test 
 Option 1: She has not studied at all. 
 Option 2: She has been studying for weeks.