Hi Ellen,
In that one, the Ethicist sets up some rules about justice and society:
The requirements for a society, which
must be met,
and are
sufficient ("when, and only when")to be just are as follows:
1) each person has an equal right to basic liberties.
2) The only time that unequal distribution of wealth/income is tolerated is when it is to everyone's benefit and attached to jobs open to everyone.
Note that #2 would be diagrammed as follows:
unequal distribution of wealth tolerated
everyone's benefit, open to all...
The contrapositive would be as follows:
NOT to everyone's benefit, open to all
unequal wealth dist NOT tolerated
The society in answer choice D violates the first rule, so it is proper to say that the society discussed is not just.
The problem with answer choice C can be seen most clearly by referring to the diagrams above. Having everyone benefit and jobs open to all is a
necessary condition to the tolerance of unequal wealth distribution; it is not
sufficient to guarantee that a society is just.
Tricky conditional language--let me know whether this is clear--thanks!
~Steve