Neither sentence is well formed. Use these: A. ( X ) He had served his people as president from 2005 until last year.
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Mister Micawber'Until' means that the problem was encountered when or after the new president was elected; 'before' means that the problem was encountered when or before the new president was elected. So 'until' requires simple past and 'before' (since it makes the order of events clear) does not require past perfect.If I've understood your explanation corre