Mizo folk songs that narrate stories or legends are known as:

The correct answer is: a) Bawh hla

Bawh hla are Mizo folk songs that narrate stories or legends. They are usually sung in a slow and solemn manner, and often accompanied by traditional Mizo instruments such as the lute and the drum. Bawh hla are an important part of Mizo culture, and are often used to teach children about the history and traditions of their people.

Here is a brief explanation of each option:

• Bawh hla are Mizo folk songs that narrate stories or legends.
• Lengzem hla are Mizo folk songs that are sung to celebrate special occasions, such as weddings and festivals.
• Dar hla are Mizo folk songs that are sung to express love or longing.
• Zai hla are Mizo folk songs that are sung to entertain or amuse.