Sentence 1: May was babysitting her neighbor's infant. 
 Sentence 3: The parents called to tell may they would be 3 hours late 
 Sentence 4:  Although May was upset, she agreed graciously 
 Sentence 5:  When the parents returned they paid May $30 then agreed to 
 Option 1: She was tired and put the baby to sleep so she could nap too. 
 Option 2: She was tired because the baby wouldn't stop crying.