【单选题】

When the evidence is______, we can be more confident of the historical scenarios we propose; when theories are weak or evidence scarce, we ought to be more______.
A．(A) attainable… intolerant

B．(B) irrelevant … dissatisfied
C．(C) available … sophisticated
D．(D) plentiful… circumspect
E．(E) present… ungrateful