Study the following statements and choose the correct option:
$I$. Asexual reproduction is common among single-celled organisms and organisms with relatively simple organization.
$II$. Conidia,bud,and gemmules are common sexual structures.
$III$. Runner,rhizome,sucker,tuber,offset,and bulb are vegetative propagules.
$IV$. The invasive weed found growing in freshwater bodies is $Zostera$.

• A
  $I$,$II$ are correct
• B
  $III$,$IV$ are correct
• C
  $I$,$III$ are correct
• D
  $II$,$IV$ are correct