India continues to face (A) / several inherent challenges (B) / to the realm of sustainable (C) / consumption and production (D). Identify the part which contains a grammatical or idiomatic error.

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**Solution:**

1. The sentence is: "India continues to face several inherent challenges to the realm of sustainable consumption and production."

2. Parts (A), (B), and (D) are grammatically correct and idiomatic.

3. The error lies in part (C): "to the realm of sustainable". The phrase "face challenges to the realm" is incorrect because "face challenges to" is not idiomatic.

4. The correct preposition should be "in" instead of "to". The phrase should be "challenges in the realm of sustainable consumption and production."

5. Therefore, part (C) contains the error.

**Answer:** (c)

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