Sentence 1: Lori failed her math exam. 
 Sentence 3: She placed an ad on tutoring website 
 Sentence 4:  Someone answered the advertisement promising to help 
 Sentence 5:  Lori tutor helped her to pass her final math exam 
 Option 1: Her best friend, Jane, offered to tutor her and Lori accepted. 
 Option 2: She needed to find a tutor quickly.