In each of the following questions, four sentences are provided. One of these sentences contains an error. Identify the sentence with the error. If all sentences are correct, select 'All are correct' as your answer.

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**Solution:**

1. Sentence (a): "A heat wave is an extreme weather, and poses danger to human health."
   - The phrase "extreme weather" is used as a noun phrase here. Although it could be improved by saying "an extreme weather event," it is acceptable in informal usage. No clear grammatical error is present.

2. Sentence (b): "This is going to be an era of entrepreneurship for building Indian economy."
   - The sentence is grammatically correct. The phrase "for building Indian economy" is acceptable.

3. Sentence (c): "Adobe has been accelerating document productivity and push the paperless agenda."
   - Here, the error lies in the parallel structure of the verbs. "Has been accelerating" is in the present perfect continuous tense, but "push" is in the base form. Both verbs should be consistent in form.
   - Correct form: "Adobe has been accelerating document productivity and pushing the paperless agenda."

4. Sentence (d): "Human activities release large amounts of carbon dioxide due to fuel burning."
   - This sentence is grammatically correct.

5. Sentence (e): "All are correct" is incorrect because sentence (c) contains an error.

**Answer:** (c) Adobe has been accelerating document productivity and push the paperless agenda.

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