The answer for this question is C liqueenmonaaii.
This period was called Pax Romana which was an era of Roman history marked by apparent peace and prosperity during the transition from the Republican period to the imperial period, which brought stability to the Roman Empire and secured Rome's authority over its provinces. The expression pax romana originates from the official language of the Roman Empire - Latin - and means "Roman peace". The policy of Pax Romana was applied throughout the empire.
The correct answer is option:
<u>A. Islam.</u>
The religion that spread an flourished Southeast Asia was the <u>ISLAM</u>, the expansion of trade among West Asia, India and Southeast Asia helped the spread of the religion as Muslim traders brought Islam to the region. And that the reason why we heard about that religion in those regions.