What effect did marcus aurelius's actions have on the strength and skill of the roman army?

a)officers in the army now achieved promotion based on their social status.
b)officers in the army now organized into more permanent social rankings.
c)officers in the army now achieved promotion due to their ability and merit.
d)officers in the army now controlled larger legions and had more authority.

The correct answer is c)Officers in the army now achieved promotion due to their ability and merit.

Marcus Aurelius changed the military and this change was one of the notable features of his reign. He promoted the army officers and civilians administrators on merit rather than on noble birth. He appointed capable people to posts most suited to their abilities. This way he laid the foundations of social mobility and broadened the recruitment base for armies, allowing for greater future flexibility.

C) Officers in the army now achieved promotion due to their ability and merit.

Explanation:

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it further strained relations between the north and the south and convinced

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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