Nerovision Express and Sample Format - Progressive vs interlaced

Hi. I am trying to make a DVD-r From divx files, but I am wandering what to set in “Sample Format”. The options are Progressive, Interlaced or Automatic. I understand that progressive should be for progressive scan dvd players, that output better quality. I know it can be set to automatic, but will automatic set it to interlace? If someone could explain it would be great, since I am very confused and I know a lot out there are, since this isn´t even mentioned in the user manual. Thanks in advance.