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, 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 With laughter beating in a clamorous tide. . . . Saw once again the heat of harvest fume Up to the empty sky in threads like glass, 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