Answer:
A. The war began because of an assassination.
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The Pax Romana was established under the government of Augustus, with a strong military outfit that decreed the end of civil wars, establishing a peaceful environment due to the forces of the arms. There was also a fear of barbaric attacks, which diminished the popular internal uprisings.
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The authority of the Roman king was called Emperor, it reflects his taking of the title Augustus or Caesar. Another title often used was imperator, originally a military honorific. Early Emperors often used the term princeps (first citizen). I'm pretty sure I gave the correct answer if you asked what was the term was for Roman King.