Which of the following statements are correct about the Amazon rainforest?
$I$. They are called the lungs of the planet.
$II$. They harbour probably millions of species.
$III$. They are the largest tropical rainforest in South America and have the highest biodiversity on Earth.
$IV$. They are being cut and cleared for cultivating soybeans or for conversion to grasslands for raising beef cattle.
Choose the correct option.

• A
  $II, III$ and $IV$
• B
  $I, II$ and $III$
• C
  $I$ and $II$
• D
  $I, II, III$ and $IV$