Final answer:
The subject of this question is Social Studies. It pertains to the inspection of locks on exterior doors, which falls under the domain of safety and security, an important aspect of social studies.
Step-by-step explanation:
The subject of this question is Social Studies. Social Studies encompasses the study of human society and its various aspects, including geography, history, civics, economics, and culture. In this case, the question pertains to the inspection of locks on exterior doors, which falls under the domain of safety and security, an important aspect of social studies.