D) European increased need for raw materials and specialized metals in order
A. Spanish conquistadors bring their horses with them across the Atlantic. Some horses escape or swim to shore after a ship sinks. The Plains Indians become expert horsemen and buffalo hunters.
This was certainly not intentional since hardly the conquistadors would want their enemies to be stronger.
B. B. Rats are aboard European ships coming to the Americas. The rats spread disease and hunt unknown numbers of smaller animals to extinction.
This is hardly intentional. Rats were almost unavoidable back then and the Europeans just did not care much about them. They weren't thinking about how the rats would cause trouble in the Americas. They were "just rats".
So the only intentional one is:
C. Columbus brought pigs to the Americas on his second voyage. The pigs provided a valuable source of food for a growing population.
Columbus brought pigs for them to serve as food eventually and so they did.
You didn’t provide any multiple chooses to the question so I can’t exactly help.
1.B The EU has been created and NATO has grown
2.C
It was difficult to change from a command to a market economy3.4.
C. by joining China and Japan to play a leading role in the world economy5.<span>D. Ethnic identity encouraged some people to break off and form their own countries after the fall of communism.</span>
It was the compromise between the small and the large states.
Basically, it established the bicameral legislature which stated that there will be a senate where everyone will be equally represented, as well as a house of representatives which will consist of people equally distributed according to how many citizens the state has.