What defines a clear conversion path?

What defines a clear conversion path?
  A)  Multiple calls-to-action across your website that lead to the same landing page.
  B)  Consistency of images and text between calls-to-action and thank you pages but use of visually unique landing pages to promote form submissions.
  C)  Consistency of images and text between calls-to-action, landing pages, and thank you pages.
  D)  Multiple calls-to-action on one page to direct users where to click next.