In the following sentences, identify the one that contains an error. If all sentences are correct, select 'All are correct'.

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**Solution:**

1. Sentence (a) is grammatically correct. It properly uses "hit a peak and then drop" to describe population trends.

2. Sentence (b) contains an error. The phrase "could been hosted" is incorrect. The correct form should be "could have been hosted" to indicate possibility in the past.

3. Sentence (c) is correct. It correctly states that the forex market is regulated by the RBI with strong exchange control regulations.

4. Sentence (d) is also correct. It properly uses "became more accessible" to describe how actors' world is now easier to reach for the public.

**Answer:** (b)

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