Hypothesis, <span>a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.</span>
Answer:
(B),(2) began to decline.
Explanation:
After the Fourth Crusade, support among Europeans for the Crusades
The Nuclear Test Ban Treaty made it illegal to test nuclear weapons in outer space, underwater, or pretty much anywhere else.
The election of 1800 marked an election (the 4th US election) when the presidential control shifted to a different political party, and it was an advance in democracy.