Both a stable government and good climate are essential for economic growth in Zone 1 countries. Country X does not enjoy economic growth, but has a good climate and a stable government.
It must be true that:
A. Country X is not in Zone 1.
B. Country X is in Zone 1.
C. The economic growth of countries outside Zone 1 has nothing to do with good climate or a stable government.
D. Country X's economic growth does not depend on good climate and stable government alone.
E. None of the above.


(D) The only conclusion we can make about Country X is that the growth of its economy depends on factors aside from climate and government.

We cannot tell whether Country X is in Zone 1; we are told that the co-occurring factors of stable government and good climate are needed for economic growth in Zone 1, but not that they alone guarantee economic growth. Some or all Zone 1 countries might also need other factors to achieve economic growth, and so Country X could very well be in Zone 1 and still not succeed economically. (A) and (B) are therefore incorrect.

(C) is incorrect as well, since we certainly cannot make any assumptions about countries outside Zone 1 or how much climate and government have to do with their economies. However, we do know that there must be some additional factor influencing Country X's economy aside from climate and government, so choice (D) is correct.
-------------

Doesn't (D) assume that economic growth depends on good climate and stable government at least? We don't know for sure though that even those factors are important.

Choice (D) does not assume that a stable government and good climate are important for economic growth. It says that in Country X those factors are not sufficient to achieve economic growth (they may or may not be "important" but they alone are not enough to achieve growth). Choice (D) is the only one that can be properly concluded from the information given, since we know Country X has those factors but does not have growth.