Answer:
C. to keep the house from catching on fire
Step-by-step explanation:
Rats pose a problem when they enter into a house. Apart from damage they cause by eating food and chewing furniture and other items, a particularly dangerous activity is chewing of wires.
When rats chew wires the negative and positive wires can touch and cause fire.
An exterminator is a person that gets rid of unwanted pests in a house.
In this scenario the exterminator is called to get rid of the rats that chew wires. This is a way to prevent fire outbreak.
So the main reason the home owner calls the exterminator is to keep the house from catching on fire