Answer: D
A catalyst is a substance that alters the reaction and doesn't involve in the reaction.So if the Manganese was a catalyst the mass would not have decreased,it would just continue aletring the reaction until its used up.
The Manganese is not acting as a catalyst
If I understood your question correctly, the culture that was present in Athens at the time when they first started with the project we today know as democracy surely did play a role in the atual development of democracy. They did not have a central authoritarian figure which would ruthlesly and without question rule over his people as was happening in other place, this was one important reason for why democracy could have been developed there in the first place.
First came the Zollverein (Toll Union) in 1833 that, by abolishing tolls between the various German principalities, made Germany into a common market. For a period of decades, until about 1860's, there were attempts at imitating in Germany the industrialization that had taken place elsewhere in Europe.
10th amendment:
“The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.”
