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The Qin Dynasty protected against invasion by

Acreating a standing army.
Cbuilding a terra cotta army.
Bfighting with chariots.
Dbuilding a great wall along the border.

Verified Answer :

The Qin Dynasty protected against invasion by "d. building a great wall along the border" although it should be noted that strong additions to the military were made as well. 

crico1039

Answer:

d. building a great wall along the border" although it should be noted that strong additions to the military were made as well.  

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