Which line from the text demonstrates an inverted syntax?
in the deserted, moon-blanch'd street,
how lonely rings the echo of my feet!
those windows, which i gaze at, frown,
silent and white, unopening down,

jenkins wanted the narrator to write a ghost story for his magazine. he wanted the narrator to give the readers a story based on the supernatural. he wanted him to give the readers real 'horror' stories and not the type of live ghosts which he had presented in his earlier stories.

i believe it is the first choice (1.)

because the major theme is(“both the wild and civilization have rules.”)

and also as u said,( based on what buck learns within the call of the wild, "both the wild and civilization have rules".this is true of humans within society as well.