The traditional system of village-level governance in Mizoram is based on:

Village Councils
Panchayati Raj
Zilla Parishads
Municipal Corporations

The correct answer is: a) Village Councils.

Village Councils are the traditional system of village-level governance in Mizoram. They are responsible for a wide range of functions, including settling disputes, maintaining law and order, and managing local resources. Village Councils are elected by the villagers and are made up of a number of members, who are usually elders or respected members of the community.

Panchayati Raj is a system of local self-government in India. It was introduced in 1992 and is based on the principle of devolution of power to the local level. Panchayati Raj institutions are responsible for a wide range of functions, including development planning, implementation of government schemes, and maintenance of local infrastructure.

Zilla Parishads are district-level local self-government institutions in India. They were established in 1961 and are responsible for a wide range of functions, including planning and development, revenue collection, and maintenance of law and order.

Municipal Corporations are urban local self-government institutions in India. They were established in 1882 and are responsible for a wide range of functions, including planning and development, sanitation, and public health.