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The correct answer is option 1: Dalla-Rajhara.
Dalla-Rajhara is the source of iron-ore for Bhilai Steel Plant. Iron-ore is a crucial raw material used in the production of steel. Dalla-Rajhara is a region located in the Durg district of Chhattisgarh, India. It is known for its rich deposits of high-grade iron-ore.
Option 2: Korba is not the correct answer because Korba is a city in Chhattisgarh, but it is not a source of iron-ore for Bhilai Steel Plant.
Option 3: Umaria is not the correct answer because Umaria is a district in Madhya Pradesh, which is not a source of iron-ore for Bhilai Steel Plant.
Option 4: Rajnand Gaon is not the correct answer because Rajnand Gaon is a city in Chhattisgarh, but it is not a source of iron-ore for Bhilai Steel Plant.
Therefore, the correct answer is option 1: Dalla-Rajhara.