The correct answer is C. Dhanbad.
Asbestos is a naturally occurring mineral that is found in many parts of the world, including Jharkhand. In Jharkhand, asbestos is largely found in the district of Dhanbad. Dhanbad is a major coal mining district, and asbestos is often found in coal seams. Asbestos is a dangerous material, and exposure to asbestos can cause serious health problems, including cancer. It is important to take precautions to avoid exposure to asbestos.
Option A: Bokaro is a district in Jharkhand, but asbestos is not largely found in this district.
Option B: Ranchi is the capital of Jharkhand, but asbestos is not largely found in this district.
Option D: None of these is the correct answer.