Which excerpt from "Going Back to School" adds to the theme that being unhappy in a particular situation can make one feel imprisoned? One splendid instant - back in the great room, Curled in a chair with all of them beside And the whole world a rush of happy voices, O The boat ploughed on. Now Alcatraz was past And all the grey waves flamed to red again At the dead sun's last glimmer. Far and vast O With laughter beating in a clamorous tide.... Saw once again the heat of harvest fume Up to the empty sky in threads like glass, O The ship slowed, jarred and stopped. There, straight ahead, Were dock and fellows. Stumbling, he was whirled Out and away to meet them - and his back​