(A) Methodical, step-by-step reasoning is inappropriate for making many real-life management decisions。

(B) Top managers have the ability to use either intuitive reasoning or methodical, step-by-step reasoning in making decisions。

(C) The decisions made by middle-and lower-level managers can be made as easily by using methodical reasoning as by using intuitive reasoning.

D) Top managers use intuitive reasoning in making the majority of their decisions。

(E) Top managers are more effective at decision-making than middle-or lower-level managers

答案是E

菜鸟问题：我看不懂OG对D和A的解释，大家帮帮忙？谢谢

the argument is consistent with managers at all levels using intuition in the minority of decisions made. Thus, choice D is inappropriate.

To the extent that less effective methods are inappropriate, the passage does not assume A, but argues for it.

The explanation to D is that D would be untrue and the argument still holds. It says that "the argument is consistent with ..." to show that it is possible that all managers are using intuition for most of decisions, e.g. top managers make 10% of the decision using intuition while lower managers use intuition for 5% of decision.

A is what the argument is trying to prove, not an assumption. If you do not know what assumption is, you have not started CR.