The correct answer is option 'B' - musical tradition in North-West India.

The Manganiyars form a community of professional folk musicians hailing from the Thar Desert region, which spans across the northwest Indian states of Rajasthan and parts of Gujarat. They have a rich musical tradition that has been passed down through generations.

Musical Tradition of the Manganiyars:
The Manganiyars are known for their unique style of music, which combines elements of Sufi, folk, and classical music. They are highly skilled in playing various traditional instruments such as the sarangi, kamaycha, dholak, morchang, and khartal.

Oral Tradition:
The Manganiyars have an oral tradition of passing down their musical knowledge from one generation to another. The young members of the community learn the intricacies of their musical tradition through apprenticeship under experienced musicians within their families.

Performance:
The Manganiyars traditionally perform at various occasions and events such as weddings, birth ceremonies, and religious festivals. Their performances are characterized by soulful renditions of folk songs and devotional music, often accompanied by energetic dance movements.

Recognition and Influence:
The musical talent of the Manganiyars has gained recognition both nationally and internationally. They have performed in prestigious music festivals and concerts across the globe, showcasing the richness of Rajasthani folk music. Their performances have captivated audiences with their haunting melodies and rhythmic compositions.

Preservation and Challenges:
Despite their musical prowess, the Manganiyars face several challenges in preserving their cultural heritage. The rapid modernization and changing societal dynamics pose a threat to their traditional way of life. Efforts are being made by various organizations and individuals to support and promote the Manganiyars and their musical tradition.

In conclusion, the Manganiyars are well-known for their musical tradition in North-West India. Their unique style and skill in playing traditional instruments, along with their soulful renditions of folk songs, have made them an important part of the cultural fabric of Rajasthan and Gujarat.