Family Brassicaceae/Cruciferae is characterised by

The correct option is B Parietal placentation

• In Brassicaceae, the gynoecium is bicarpellary, rarely tricarpellary, syncarpous, ovary superior, unilocular, becomes bilocular due to the development of false septum, parietal placentation, ovaries many, style short, stigma simple and bifid.
  
• Parietal placentation is found in bicarpellary to a multicarpellary syncarpous ovary. Unilocular ovary becomes bilocular due to the formation of the false septum.

So, the correct answer is 'Parietal placentation'.