NN们来看看这题!

Political theorist: The chief foundations of all governments are the legal system and the police force; and as there cannot be a good legal system where the police are not well paid. It follows that where the police are well paid there will be good legal system.

The reasoning in the argument is not sound because it fails to establish that:

(A) many governments with bad legal systems have poorly paid police forces

(B) bad governments with good legal systems must have poorly paid police forces

(C) a well-paid police force cannot be effective without a good legal system

(D) a well-paid police force is sufficient to guarantee a good legal system

(E) some bad governments have good legal systems

正确答案是D,没头绪,觉得没有一个答案是对的.D的意思不是和题目的结论一样么?请NN指点.

because it fails to establish that意思就是原文无法证明________

显然结论是无法证明的，因为结论（警察工资高推得法律系统好）是前提（警察工资低推得法律系统差）的否命题，不等价

Thanks a lot!