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They just dumped me here and left . " This Doctor was different . Charley knew all about regenerations and how they could change him , but this Doctor had sadness written all over his face , a far cry from her Doctor who greeted everyone as if they were old friends , even if they have never met . Something terrible must have happened to him . " The CIA were never the friendliest of people " .

Question:
Why does the doctor 's sadness lead the speaker to believe something terrible must have happened to him ?
Select from: A). He is verbally communicating how horrible the CIA had treated him. B). The doctor 's sadness is enough to indicate that he has been through difficult times. C). The speaker recognizes the doctor from a public hearing about CIA abuses. D). The speaker is an expert at reading body language and does so towards the doctor.