Consider the following statements about food chain

$I.$ The transfer of energy from producers to top consumers through a series of organisms is called food chain

$II.$ A food chain is always straight and proceeds in a progressive straight line

$III.$ In a food chain, there is unidirectional flow of energy from sun to producers and subsequently to series of different types of consumers

Which of the statements given above are correct?

• A

  $I\; and \;II$

• B

  $I \;and\; III$

• C

  $II\; and\;III$

• D

  $I, II\; and \;III$