To my ear it is a mix of advisory should and expectational should , but advisory should (your A) seems to be more prominent. There is even a shade of evaluative should present in the statement. ) [It is indisputable / It is only reasonable] that the head of a nation should be such a person.
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pructusThose seem to be good terms, "advisory" and "expectational"...Yes. Well, I like them better than the terms so often used in the linguistics literature: deontic and epistemic.