The correct answer is: a) Pena
The pena is a traditional Manipuri musical instrument resembling a violin. It is made of wood and has a long, thin neck with a gourd resonator. The strings are made of gut or nylon, and the instrument is played with a bow. The pena is used to accompany singing and dancing, and it is also played as a solo instrument.
The sarod is a stringed instrument from India. It is similar to the sitar, but it has a longer neck and a smaller body. The sarod is played with a plectrum, and it is used to accompany singing and dancing.
The sitar is a stringed instrument from India. It has a long, fretted neck and a gourd resonator. The sitar is played with a plectrum, and it is used to accompany singing and dancing.
The veena is a stringed instrument from India. It has a long, fretted neck and a gourd resonator. The veena is played with a plectrum, and it is used to accompany singing and dancing.
The pena is a unique instrument that is not found in any other part of the world. It is a beautiful instrument with a rich history, and it is an important part of Manipuri culture.