Regarding blood circulation,it may be said that in $Pheretima$,the dorsal vessel is a:

• A
  Collecting vessel in first two segments and distributing vessel in other
• B
  Distributing vessel in first five segments and collecting vessel in other
• C
  Collecting vessel in first thirteen segments & distributing vessel in intestinal region
• D
  Distributing vessel in first thirteen segments & collecting vessel in intestinal region