Answer: I believe the answer is:
B: developing the conceptual narrative and theme.
Explanation: The main job description of a curator is to build up a museums' collection. Usually in specialist areas, like Greek artifacts or old photos from a certain time period.
The Googs says that curators also "develop ways in which objects, archives and artworks can be interpreted, through exhibitions, publications, events and audio-visual presentations."
I could be totally wrong about the answer, and I'm so sorry if I am. But I know for sure that the answer is either A or B.
I hope this helps at least a little! Have an amazing day!