The pepa is a traditional Assamese instrument made from:

The correct answer is: a) Bamboo.

The pepa is a traditional Assamese instrument made from bamboo. It is a long, thin tube with a mouthpiece at one end and a flared bell at the other. The pepa is played by blowing into the mouthpiece and vibrating the lips. The sound of the pepa is high-pitched and piercing. It is often used in folk music and religious ceremonies.

The other options are incorrect. Option b, buffalo horn, is the material used to make the surnai, a traditional Assamese instrument. Option c, metal, is the material used to make the dhol, a traditional Assamese drum. Option d, terracotta, is the material used to make the ghanta, a traditional Assamese bell.