The correct option is
B Graphic / Photograph / Illustration / Picture / Art work
The format of a poster is as follows:
NAME OF ISSUING AUTHORITY
ILLUSTRATION (WITH A CAPTION)
TAGLINE
TITLE/NAME OF THE EVENT (exhibition, workshop, etc.)
SPECIAL ATTRACTIONS
WHEN (date and time) AND WHERE
ENTRY FEES (if any) AND OTHER RELEVANT INFORMATION
CONTACT INFORMATION
Going by this format, the second blank should include the illustration of the poster, like a photograph with caption to emphasise on the main focus. Hence, Option B is correct. The rest of the options do not express this condition, hence incorrect.