Sentence 1: I always try to close my chicken coop just before dark. 
 Sentence 3: The one that does not go in is blind 
 Sentence 4:  I think she cannot tell when the sun goes down 
 Sentence 5:  I always have to wait to close the coop when she is ready 
 Option 1: All of the chickens go in without a problem. 
 Option 2: All of the chickens go in the coop by then except one.