Consider the following statements.
1. Acids are sour in taste and change the colour of blue litmus to red.
2. Bases are bitter and change the colour of red litmus to blue.
3. Litmus is a natural indicator.
Which of the statements given above is/are correct?

A. 1 and 2

B. 1 and 3

C. 2 and 3

D. 1, 2 and 3

Answer: Option D