What is the Hukou System (Law)?

a system of household registration used in mainland China.

Explanation:

Hukou is a system of household registration used in mainland China. The system itself is more properly called "huji", and has origins in ancient China; hukou is the registration of an individual in the system. A household registration record officially identifies a person as a permanent resident of an area and includes identifying information such as name, parents, spouse and date of birth. A hukou can also refer to a family register in many contexts since the household register is issued per family, and usually includes the births, deaths, marriages, divorces, and moves, of all members in the family.

ok sorry the answer is a. by their religion

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