The most accurate option regarding how the fisherman’s motivation moves the plot forward is:
The fisherman fears dying slowly and asks a question that results in rising action.
In this part of the story, the fisherman's fear of his imminent death leads him to cleverly question the genii about how he could fit into the vase. This not only serves to buy him some time but also introduces rising action as it creates an opportunity for the fisherman to engage the genii further and potentially devise a way to escape his fate.