Role 题

今天作了一道role题，突然觉得--是不是可以用阅读的方法作逻辑呢？

呵呵，备考苦闷，说出来让大家笑一笑~~  

当然，如果觉得这种方法将害人无数的话，还请大家一定要说出来，以警醒世人啊！！！

The stable functioning of a society depends upon the relatively long-term stability of the goals of its citizens（结论）. This is clear (表示理由) from the fact  that unless the majority of individuals have a predictable and enduring set of aspirations, it will be impossible for a legislature to craft laws that will augment the satisfaction of the citizenry, and（表示并列关系）it should be obvious （表示另一个理由。 其中clear 和obvious 平行） that a society is stable only if its laws tend to increase the happiness of its citizens.

The claim that a society is stable only if its laws tend to increase the happiness of its citizens plays which one of the following roles in the argument?

(A) It is the conclusion of the argument.

(B) It helps to support the conclusion of the argument.

(C) It is a claim that must be refuted if the conclusion is to be established.

(D) It is a consequence of the argument.