The botanical names of onion and garlic can be written as ...... respectively.

• A
  $Allium \ cepa$ and $Asphodelus \ tenuifolius$
• B
  $Allium \ sativum$ and $Allium \ cepa$
• C
  $Asphodelus \ tenuifolius$ and $Allium \ sativum$
• D
  $Allium \ cepa$ and $Allium \ sativum$