Answer: Although I enjoy chocolate ice cream
Explanation: An adverbial clause is a group of words that together function as an adverb. In this sentence, the adverbial clause is an adverb of concession with the subordinating conjunction "Although", and it is the one that contrasts the main idea. The sentence "Although I enjoy chocolate ice cream" explains that their favorite flavor is strawberry, despite them liking chocolate ice-cream, having then the function that an adverb would have by itself. Moreover, an adverbial clause contains a subject and a verb; In this case, "enjoy" is the verb and "chocolate ice-cream the subject.
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.
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I think it’s the social hierarchy...?