In each of the following sentences, one sentence may contain a grammatical error. Identify the sentence with the error. If all sentences are correct, select 'All are correct'.

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**Solution:**

1. Sentence (a) is grammatically correct. The phrase "Countries have announced their commitment to lofty environmental goals" is properly structured.

2. Sentence (b) is correct. "The foundation stone of the India Gate was called the All India War Memorial" is a factual and grammatically sound sentence.

3. Sentence (c) is also correct. "Social media platforms regularly manage user content on their website" uses proper subject-verb agreement and sentence structure.

4. Sentence (d) contains an error. The phrase "didn’t happened" is incorrect because after "didn’t" (did not), the base form of the verb should be used. The correct phrase is "didn’t happen".

5. Sentence (e) is incorrect because there is an error in sentence (d).

**Answer:** (d)

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