4. What is the unit of time in the legend of this map showing human migration?

(A) 100 years before present
(B) 1.000 years before present
(C) 10.000 years before present
(D) 100.000 years before present
time in ?? years
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統計: A(7), B(26), C(29), D(13), E(0) #2160434
統計: A(7), B(26), C(29), D(13), E(0) #2160434