An effect of the decline in trade after the fall of roman empire is : There was a shift to a rural society
after the fall of roman empire, more and more people have ownerships over their land and buildings ( previously it all belong to the empire)
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The Black Hand was the name of a secret Serbian society. The correct option among all the options given in the question is the third option. The Black Hand was the secret society that was involved in the assassination of Serbian Royal couple in the year 1903. This secret military society was formed on 9th of May in the year 1911.
The great awakening focused more on faith while the enlightenment focused more on reason and scientific observation. So your answer would be D