Sentence 1: Rachel is in college to become a nurse. 
 Sentence 3: She has a big test coming up and has been studying very hard 
 Sentence 4:  On the day of the test, Rachel was somewhat nervous about how she did 
 Sentence 5:  Because she studied to hard, Rachel made an A on the test 
 Option 1: The courses that she takes are very easy. 
 Option 2: The courses that she takes are very challenging.