The host crop plants may be resistant to insect pests due to the
$I$. Morphological characteristics
$II$. Biochemical characteristics
$III$. Physiological characteristics
Choose the correct option.

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

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