The correct option is
B Graphic / Photograph / Illustration / Picture / Art work
A poster is generally made in this order:
1. The name of the organisers
2. A graphic image that represents the poster
3. The heading
4. The message/details of the event
5. The date, place and time when the event will be held
6. Contact details of a person for attending the event
Hence, blank 41 is filled with 'Graphic / Photograph / Illustration / Picture / Art work'
So, option B is correct.
Option A: The Date, Time and Venue are mentioned later in the poster. It does not come after the banner (containing the name of the organisers). Hence A is incorrect.
Option C: The slogan is placed after the illustration or graphic (because the image attracts more attention than the slogan). It does not come in blank 41. Hence C is incorrect.
Option D: The organiser's photographs are optional and may not be used at all, in a poster. (An illustration, however, helps to catch the attention of the onlooker.) Hence option D is incorrect.