Answer:
B. It lasted an amazing 67 years.
Step-by-step explanation:
None of the other answers make sense.
A. It was not peaceful because of his religious devotion, nor was it fully peaceful.
C. There was no beginning with an unusual co-rulership with his father.
D. His nephew never overthrew him in a civil war, as he passed; a civil war with his nephew never even occurred.
*I took the test and got it right too. :)