Final answer:
In the book Fahrenheit 451, it is unclear who reported Montag's house to the fire department. Some theories point to Mildred's friends or the government.
Step-by-step explanation:
In the book Fahrenheit 451, it is unclear who reported Montag's house to the fire department. However, there are a few theories and possibilities. It could have been Mildred's friends, who were aware of Montag's possession of books and reported him out of fear or concern for their own safety. Another possibility is that it was the government itself, that monitors and controls the citizens' activities. The government may have suspected Montag of reading books and reporting him was their way of maintaining control over the population.
The society in "Fahrenheit 451" is one where neighbours commonly betray each other to maintain conformism and adherence to the law against book ownership. This act of reporting emphasizes the theme of censorship and the oppressive control of information in the novel's dystopian society.
Unfortunately, the book does not explicitly reveal who reported Montag's house to the fire department, leaving it open to interpretation.