Did you read the passage anyways all you have to do to get your answer is read it’s right there in the passage but your answer is the first one
the answer is 'Gregor transforming into an insect'.
Im·mi·nent
/ˈimənənt/
adjective
1.
about to happen.
"they were in imminent danger of being swept away"
synonyms:impending, close (at hand), near, (fast) approaching, coming, forthcoming, on the way, in the offing, in the pipeline, on the horizon, in the air, just around the corner, coming down the pike, expected, anticipated, brewing, looming, threatening, menacing;
informalin the cards
"a ceasefire was imminent"
Planning or like brainstorming, but yes you are correct