This region has vast reserves of coal & iron ore. iron ore is cheaply available thus , raw materials for iron & steel industries are available eaisly.

The correct answer is option 'A': Iron-ore and Coal-ore.

Explanation:
Chota Nagpur Plateau, also known as the Ranchi Plateau, is a large plateau in eastern India. It covers the states of Jharkhand, Bihar, West Bengal, and Odisha. The plateau is known for its rich mineral resources, particularly iron-ore and coal-ore.

1. Iron-ore:
- Chota Nagpur Plateau is a significant source of iron-ore in India. The region has extensive deposits of hematite and magnetite, which are the two most important types of iron-ore.
- Iron-ore is a key raw material for the steel industry, and the availability of iron-ore in Chota Nagpur Plateau has led to the establishment of numerous steel plants in the region.
- The iron-ore deposits in the plateau are mainly found in the states of Jharkhand and Odisha. Some of the major iron-ore mines in the area include Noamundi, Gua, Kiriburu, Meghahatuburu, and Bolani.

2. Coal-ore:
- Chota Nagpur Plateau is also known for its abundant coal deposits. The plateau has some of the largest coalfields in India, making it a major coal-producing region.
- The coal deposits in the plateau are mainly of bituminous and sub-bituminous types, which are suitable for power generation and industrial uses.
- The coalfields in the region are primarily located in the states of Jharkhand and West Bengal. Some of the prominent coalfields include Jharia, Raniganj, Bokaro, and Karanpura.

3. Other minerals:
- Apart from iron-ore and coal-ore, the Chota Nagpur Plateau also has deposits of other minerals like copper, limestone, mica, bauxite, and uranium.
- Copper deposits are found in the Singhbhum district of Jharkhand, while limestone deposits are present in the Hazaribagh and Palamu districts.
- The plateau is also known for its extensive mica deposits, particularly in the Koderma district of Jharkhand.

In conclusion, the Chota Nagpur Plateau is rich in iron-ore and coal-ore, making it an important region for the mining and steel industries in India. The availability of these minerals has contributed to the economic development of the region and has attracted numerous industries and investment.