ACBEDF
Option (a) The first statement mentions a new problem that is plaguing Mohammed Fayed. Out of the options, sentence C is the most apt as it describes what this possibly could be. Sentence B starts off the accusation but doesn't describe what it is. Sentence B should follow sentence C. Sentence E then, explicates upon it by mentioning the import of the accusation. Sentence D then goes on to mention why this would irritate the Harrods customer who prides himself on being a connoisseur. Sentence F then describes it exactly.
This makes choice (a) correct.