The correct answer is: a) Pnar, Biate, War.
Pnar, Biate, and War are all languages spoken by the Khasi people of Meghalaya. They are all part of the Mon-Khmer language family. Khasi is the official language of Meghalaya, and is spoken by about 50% of the population. Pnar is spoken by about 10% of the population, Biate is spoken by about 5% of the population, and War is spoken by about 2% of the population.
Bengali, Assamese, and Nepali are all languages spoken in the neighboring state of Assam. Hindi, Mizo, and Manipuri are all languages spoken in other parts of India. Bodo, Karbi, and Rabha are all languages spoken by the Bodo people of Assam.
Pnar, Biate, and War are all indigenous languages of Meghalaya. They have been spoken in the region for centuries. Bengali, Assamese, Nepali, Hindi, Mizo, Manipuri, Bodo, Karbi, and Rabha are all languages that have been introduced to Meghalaya more recently. They are all spoken by minority populations in the state.