I believe that the most fitting answer for this question would be A, reading from the script. I remember I gave a speech one time and I read almost entirely from a page that I had written beforehand. It was judged as much weaker as a speech that I had memorized beforehand. In addition, varying your delivery can add interest and keep your audience engaged. Notecards are more effective than reading from a script, as you will not be reading word-for-word and will only be using your notecards as jumping-off points. Hope this helps.