What ended the Berlin crisis? A) the construction of the Berlin Wall
B) the end of communism in East Berlin
C) the rush of immigrant into West Berlin
D) the American efforts during the Berlin airlift

D.

Explanation:

I'm going to assume that this was the 1948-49 Berlin Crisis. West Berliners were starving after Stalin had cut supply lines from the west to give supplies to West Berliners. Truman had ordered that the supplies would instead be flown in, which saved West Berlin from falling to communism, many people saved, the future prosperity of West Berlin, and a major propaganda victory for the U.S.A.

explanation:

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2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.