Despite its attractiveness, investing abroad can still pose big risks, ranging from the potential for political instability in some countries
to the shortage of regulations to protect investors and a serious lack of information about investments in others.Option elimination - Identifying the idiom at play, i.e., from X to Y, is pretty straightforward. But the complication arises when we have "and." If we look at the non-underlined part, it says from X in some counties, so we need "in others" to complete the thought. So it says From X in some counties to Y in others. So it has to be those two additional risks (it doesn't matter - the list could have 3 or 4 or 5 or more risks combined by and) part of Y.
Had it been from X and Z in some countries to Y in others - that's correct.
Or From X and Z in some countries to Y and A in others - that's correct too.
It's essential to understand the meaning.
(A) to the shortage of regulations to protect investors and a serious lack of information about investments in others - From X in some counties to Y and Z in others. Correct.
(B) to the shortage of regulations to protect investors and in others a serious lack of information about investments - It says From X in some countries, to Y and in others Z. Now the location marker is not applicable to Y. Wrong.
(C) and the shortage of regulations to protect investors and a serious lack of information about investments in others - From X in some countries and Y and Z in others. The basic problem is that the idiom usage is wrong.
(D) and the shortage of regulations to protect investors to a serious lack of information about investments in others - From X in some countries and Y to Z in others. The location marker for Y is missing.
(E) to the shortage of regulations to protect investors in others and a serious lack of information about investments - From X in some counties to Y in others and Z. The location marker is missing for Z.