$I$. Root hairs are unicellular.
$II$. Trichomes are multicellular usually.
Identify the correct statement and select the correct option.

• A
  $I$ and $II$ are correct.
• B
  $I$ and $II$ are incorrect.
• C
  $I$ is correct,but $II$ is incorrect.
• D
  $II$ is correct,but $I$ is incorrect.