The answer is D: works towards the free movement of goods and the people across Europe
The occupation that it referring to is : skilled and unskilled miners
This treaty was enacted in 1880 , back then the job as a miners is pretty much the equivalent of today's engineer in the term of hotness and availability.
Hope this helps
They are most likely suffering from an anxiety disorder
The answer to your question is West Africa located in the southeast of Algeria.
