The answer D although is the best correct one, it has some flaw in reasoning.
Answer D says that GDP per capita in EU did not decrease by no more than $1 000 in 1990 than in 1990.
If the decrease was lower than $1000, the assumption would hold perfectly true, since for 6000 increase in difference to hold true, at most $999 drop in GDP per capita of EU is necessary at worst case scenario.
The answer D assumes that the drop in GDP per capita in EU could be straight $1000
Thus let's say GDP per capita in 1980 in country A was $ 6000 and in EU $ 1000
Then let's say in 1990 it was still $6000 for Country A and EU's GDP per capita dropped to zero! (We can assume that from answer D). The conclusion that living standards improved in country A will not hold true then, as u can see from my example.
D is the best answer but it has the above mentioned flaw, what do u guys think?
Never give up,,,