To expand his empire, Tang Taizong primarily

a) relied on his military skills.

b) used his trade relationships

c) chose loyal friends as officials

d) won over the peasants in rural areas.

To expand his empire, Tang Taizong primarily a) relied on his military skills. Tang Taizong relied on a series of military campaigns to unify East and Central Asia and covered most of the territory of present-day China, Vietnam, Central Asia all the way to Kazakhstan. His army also annexed many allied armies which were considered enemy armies which lived near modern day Kyrgyzstan.