In Question, a sentence/ a part of the sentence is underlined. Below are given alternatives to the underlined part at (A), (B), (C) which may improve the sentence. Choose the correct alternative. In case no improvement is needed your answer is (D). Mark your answer in the Answer Sheet.
Regulators SEBI or RBI did not act when sensex dipped by over 200 points in a day, as many as 13 times since january 2000.