'among' vs 'of'

[mvidhya.murali]

Experts,
Please help clarify the distinction between the two: 'among' vs 'of'
I came across a new OG problem from the 2016 edition. I've changed words from the actual problem. The credited answer choice used:
A) "among his contemporaries he was considered the better actor"

The sentence intended to compare the person 'he' with only one other person and tell that 'he' was the better actor among the two. So, I thought the above usage A) was incorrect because I understood the above usage to be comparing him with all actors who are his contemporaries.

1) But since A) is the credited choice, I guess it uses 'among his contemporaries' correctly as an adverb - who considered him the better actor? Is this understanding correct?

2) is there a difference between these two?
among the flowers, rose is the most fragrant (or) of all the flowers, rose is the most fragrant -> both correct
of all his contemporaries, he was considered the better actor (or) among his contemporaries, he was considered the better actor --> is there a difference?


wrong answer choices used the following construction:
B ) he was considered among his contemporaries to be the better actor
C) he was considered among his contemporaries as the better actor
I was able to eliminate the C) because it used 'considered as'. usage B) had errors in other parts of the sentence. So I was able to eliminate. But is the part of B) transcribed above correct as it written now and does it convey the same meaning as A)?

Also for others who are studying for gmat, this SC problem uses possessive poison in the CORRECT ANSWER choice. Something like.. 'Although X's success was overshadowed by that of his friend, among his contemporaries he was considered the better actor" - this was also a reason I dismissed this choice but this is the credited choice. Refer 138 in og 2016.

[RonPurewal]

hello,
OG is a banned source here.

this extends not only to the text of the problems, but also to discussion of the problems. (it does not mean "let's just ask about OG problems without quoting them", as that would render the whole prohibition meaningless.)

thank you.