Answer:
D: A divine monarchy because it was hereditary
Responding to xenophobic concerns, Congress passed an emergency law restricting immigration in 1921. Among other provisions, the Act established a quota (a proportional share of a total) for nationalities on the basis of their numbers in the U.S. in 1910.
The missing detail is: a quota.
In order to insulate the courts from POPULAR PASSIONS, the founders ensure that federal judges are APPOINTED FOR LIFE. The principal objective of the life tenure given to federal judges is to insulate them external pressures. The life term provides job security for them and enable them to do what is right under the law, since they do not have to fear that their position will be terminated if they make unpopular decisions.
The people of the Fourth Crusade were the ones who captured and partitioned the empire.
