Answer:
Captain Beatty slapped the old woman because she refused to answer his questions .
Step-by-step explanation:
In Fahrenheit 451, Captain Beatty slaps the woman as she does not reveal the location of the book. Because she knew that if they find the books, they would burn them down. Yet, they had a tip from the neighbour where she hides the book. So, captain Beatty’s men went to the attic and started burning the books. Where Montag steals a book. Both Beatty and Montag insists the woman to leave the house which she refuses.