Answer:
B. relied principally on a large infantry, on its strength of manpower, rather than developing more expensive cavalry.
Explanation:
The tang military relied principally on a large infantry rather than developing more expensive cavalry because they use light infantry in order to feint the enemy and bring them into traps. The enemies comes after light infantry and when they were trapped, then the cavalry attack on the enemy and causes severe damage to them. These tactics were famous at that time so the tang army rely on light cavalry as compared to large cavalry.
