Golden rice
$I$. It is a transgenic variety of rice.
$II$. It contains a good quality of $\beta$-carotene (provitamin-$A$).
$III$. $\beta$-carotene is a principal source of vitamin-$A$.
$IV$. The grains of the rice are yellow in colour due to $\beta$-carotene. The rice is commonly called golden rice.
Which of the statements given above are correct?

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