'Leave' = move away from. B is possible but really rather weird. Only 'get off' seems natural to me, though in the old days they 'dismounted'.
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Mister Micawber… though in the old days they 'dismounted'.Ah! I rather like that. I'm going to start saying that.
Mister Micawberthough in the old days they 'dismounted'.Hi Mister Micawber,