The tang dynasty ruled over a strong and unified china because of which of these reasons?
a. the chinese were tired of civil war and focused on opening new businesses.
b. they had a strong army that could defend the borders and repel invaders.
c. they developed safe trade routes between chinese cities and siberia.
d. the population was growing because of improvements in agriculture.

B. They had a strong army that could defend the borders and repel invaders.

Explanation:

The Tang Dinasty was the head of the Chinese empire for almost three centuries, form 617 to 907 AC they created a strong and unified Chinese empire thanks to its vast army and their strong defense tactics that lead them to have the power to repel invaders and keep everyone from rebelling.

it´s related to his charming character.

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for example develop your sense of humor.

answer; provide for the common defense: