On average, developed countries spend about $ annually per capita on health care a)18,000 b)4,000 c)14,000 d)8,000 e)25,000

The correct answer is B) 4,000. 
The amount from country to country (developed countries) varies, in some cases significantly, at in some cases it is around 8,000 while at other around 1,000 USD per capita annually, but most of them are in between 3,000 and 5,000 USD, and the average comes at roughly 4,000 USD.

D. latin america followed by africa

Answer (d) may increase or decrease porosity through dissolution or deposition;