Sentence 1: Cynthia needed to dye her hair because her roots were growing out. 
 Sentence 3: At the store, Cynthia noticed that candy was on sale 
 Sentence 4:  Cynthia also bought a bag of candy with her hair dye 
 Sentence 5:  Cynthia walked home and colored her hair 
 Option 1: Cynthia walked to the drug store to buy some peroxide. 
 Option 2: Cynthia walked to the drug store to buy some medicine.