The main purpose of a service panel in a house is to a. keep the meter working correctly. b. connect the service drop to the house. c. provide automatic circuit protection and prevent fires. d. keep electrical hazards localized.

I think the best answer would be the last option. The main purpose of a service panel in a house is to keep electrical hazards localized. Service panels are used to identify circuit loads and isolate these loads so when  you want to check the equipment you can easily identify the line. Also, it would serve as the isolation point to avoid any electrical hazards.

The answer is as follows in the photo