GMAT Sentence Correction (SC) | Re: At the annual stockholders meeting, investors heard a

I have a question.. "among them......" in the answer choice 'd' is a prepositional noun modifier modifyin the noun 'challenges' and not an absolute phrase? N If "among them....." is a prepositional noun modifier then why is there a comma to separate this phrase? n If its an absolute phrase (noun + noun modifier) then the noun modifier(among them) which is a prepositional noun modifier modyfyin the nouns "the threat n the decline"