Sentence 1: Shelby attended an after school arts class. 
 Sentence 3: Shelby excused herself to the restroom during the class 
 Sentence 4:  When she returned, her supplies were gone 
 Sentence 5:  Another student told Shelby who the thief was 
 Option 1: She brought her art supplies with her. 
 Option 2: She forgot to bring her art supplies with her.