Which of the following statements is incorrect regarding deforestation?

• A
  At the beginning of the twentieth century,forests covered about $30$ percent of the land in India.
• B
  Forest cover of the world is rapidly depleting.
• C
  The National Forest Policy $(1988)$ of India has recommended $67$ percent forest cover for the plains.
• D
  By the end of the twentieth century,forest cover in India had shrunk to $19.4$ percent.