An important social institution in traditional Mizo villages was the:

Zawlbuk (bachelors' dormitory)
Panchayat
Gurukul
Ashram

The correct answer is: a) Zawlbuk (bachelors’ dormitory).

A Zawlbuk is a traditional Mizo bachelors’ dormitory. It is a place where young men live together and learn about their culture and traditions. The Zawlbuk is also a place where young men can socialize and develop their leadership skills.

A Panchayat is a traditional Indian village council. It is a group of elders who meet to discuss and resolve disputes within the village. The Panchayat also plays a role in planning and implementing development projects in the village.

A Gurukul is a traditional Indian school. It is a place where students live and study with a guru, or teacher. The Gurukul is a place where students learn about Hindu scriptures and philosophy.

An Ashram is a Hindu monastery. It is a place where Hindu monks and nuns live and practice their religion. The Ashram is a place of peace and tranquility.

In conclusion, the correct answer is: a) Zawlbuk (bachelors’ dormitory).