The correct answer is: a) Manganese ore.
Sandur is a taluk in Bellary district of Karnataka, India. It is known for its manganese ore deposits. The Sandur Manganese Ore Company Limited (SMCO) is a public sector undertaking that was established in 1965 to mine and process manganese ore. The company has its headquarters in Sandur town.
Manganese ore is a mineral that is used to make steel. It is also used in batteries, ceramics, and other products. The Sandur Manganese Ore Company Limited is one of the largest producers of manganese ore in India. The company exports its products to countries such as China, Japan, and South Korea.
The other options are incorrect because:
- Fertile agricultural lands: Sandur is not known for its fertile agricultural lands. The taluk is located in a dry region and agriculture is not a major economic activity.
- Skilled artisans: Sandur is not known for its skilled artisans. The taluk does not have a strong tradition of handicrafts or manufacturing.
- Historical forts: Sandur does not have any historical forts. The taluk is not a major tourist destination.