The primary language used in most Mizo newspapers is:

Mizo (Lusei)
English
Bengali
Hindi

The correct answer is: a) Mizo (Lusei).

Mizo (Lusei) is the primary language used in most Mizo newspapers. It is a Sino-Tibetan language spoken by the Mizos, an ethnic group native to the Indian state of Mizoram and the Chin State of Myanmar. Mizo is written in the Latin script.

English is the second most widely spoken language in Mizoram, and it is used in government and education. However, it is not used as widely as Mizo in everyday life.

Bengali and Hindi are two other major languages spoken in India, but they are not spoken in Mizoram.