Which one of the following is a medicinal plant?
Calendula officinalis, the pot marigold, ruddles common marigold or Scotch marigold, is a flowering plant in the daisy family Asteraceae. It is probably native to southern Europe, through its long history of cultivation makes its precise origin unknown, and it may be of garden origin. The Latin specific epithet officialis refers to the plant’s medical and herbal uses.
So the correct answer is option B.