Sentence 1: I smelled something foul in the house. 
 Sentence 3: I followed the smell up to the attic 
 Sentence 4:  I found out that the smell was a dead animal 
 Sentence 5:  I disposed of the animal and my house no longer smelled foul 
 Option 1: I found a rotten potato under the sink. 
 Option 2: I decided to investigate.