Question

throughout the pax romana, one of the strongest unifying forces in the empire was a the republic. b christianity. c the oligarchy. d the government.

Explanation:

The Pax Romana was a period of Roman Empire (not Republic, so A is wrong). Oligarchy wasn't the unifying force (C is wrong). The government (D) and its infrastructure, laws, etc., helped unify the empire. Christianity rose later, not during Pax Romana's main unifying phase (B is wrong). So the government's systems, stability, and administration unified the empire.

Answer:

D. the government.