In statement given below, a part of the sentence is enclosed in quotation marks. Below are given alternatives to the quotes part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is the answer.In India today many of our intellectuals still talk in terms of the French Revolution and the Rights of Man, not appreciating that "much has happened" since then.

• A. much has been happening
• B. much had happened
• C. much might happen
• D. No improvement