If mdbc = 65º, what is the relationship between ad and cd? a ad > cd b not enough information c ad < cd d ad = cd

  [B]:  "not enough information [provided]" .

 {since we are not given a diagram; and, for that matter, we are not given ANY informatioabout the where "Point A" is located—AT ALL; or for that matter, ANY MENTION WHATSOVER about "Point A"—within THIS VERY QUESTION —
   {not to mention, for instance, the fact that there is no information as regard to any angle containing "Point A" in relation to the [particular angle in THIS VERY QUESTION — (which does NOT mention any angle containing "Point A" {as aforementioned/as can be inferred}.

    Note:  By the way, thank you for providing "answer choices".  Otherwise, this question would be an "improper question" for "incomplete question content"/ or perhaps: "question is illogical".

I hope that my explanation —albeit lengthy and superfluous — makes sense.
If you need furhter explanation, Please reply to this answer.  Best wishes!