DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 4 Indicators change their colour when added to a solution containing an acidic or a basic substance. Turmeric, litmus, China rose petals (Gudhal), etc., are some naturally occurring indicators. Naturally occurring indicator litmus

• A. is extracted from lichens
• B. has available as red and blue litmus paper
• C. has purple colour in distilled water
• D. All the above are correct