To become a citizen of the United States, you must
A. pass an English and government test.
B. file a request form in a federal court.
C. have lived in the United States for at
least six months.
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D. be at least 21
years
old.

Explanation:

To  become a U.S. citizen you must meet the following requirements:

1) You must be 18 years of age or older.

2) You must have authorization to live and work in the U.S. on a permanent basis (informally known as a green card) for at least five years (or three years, if married to a United States citizen).

d. the great plains       hop3 this yo

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.