D.)increased migration of people for economic opportunity
The Answer is Rocky Mountains
On this problem you don't need to subtract. They want to know the total amount of people who attended so you would add.
1 1 1 (carried over numbers)
12,679 (Line it up with 8491, ones place to ones place and so on)
+8,491
21170 (answer)
The correct answer is letter C.
Explanation: Nubia could use elements of Egyptian culture to create its own imperial power. Nubia has been in constant contact with Egypt for much of its history, and Egypt has at various times advanced the region with military and colonizing expeditions. Nubia, however, has developed independently of Egypt since prehistory.
