The passage clearly states loud remarks about sneaks and cowards were made in Erica's hearing, so A matches I. Margery Fenworthy was disliked by all (very unpopular), so B matches II. The line 'Oh Margery...it's you who never give us a chance to be decent' was said by Pat, so C matches III. Pat had a twin sister, so D matches IV. This gives A-I, B-II, C-III, D-IV.