code: def serialize_seeds(seeds, block):
      
      for seed_dict in block.seeds:
          seed = etree.SubElement(seeds, 'seed')
          # options in xml starts with 1
          seed.set('option', unicode(seed_dict.get('answer', 0) + 1))
          seed.text = seed_dict.get('rationale', '')
docs: Serialize the seeds in peer instruction XBlock to xml
  
      Args:
          seeds (lxml.etree.Element): The <seeds> XML element.
          block (PeerInstructionXBlock): The XBlock with configuration to serialize.
  
      Returns:
          None