In both of these cases, it would be implied that the [blah blah blah] modifier was referring to A, B, and C.
Take for example #110 in OG 13/2015:
Published in Harlem, the owner and editor of the Messenger were two young journalists, Chandler Owen and A. Phillip Randolph, who would later make his reputation as a labor leader.
A. Published in Harlem, the owner and editor of the Messenger were two young journalists, Chandler Owen and A. Phillip Randolph, who would later make his reputation as a labor leader.
B. Published in Harlem, two young journalists, Chandler Owen and A. Phillip Randolph, who would later make his reputation as a labor leader, were the owner and editor of the Messenger.
C. Published in Harlem, the Messenger was owned and edited by two young journalists, A. Phillip Randolph, who would later make his reputation as a labor leader, and Chandler Owen.
D. The Messenger was owned and edited by two young journalists, Chandler Owen and A. Phillip Randolph, who would later make his reputation as a labor leader, and published in Harlem.
E. The owner and editor being two young journalists, Chandler Owen and A. Phillip Randolph, who would later make his reputation as a labor leader, the Messenger was published in Harlem.
OA:
C
Here, it's understood that the "who would..." clause is modifying
both men in the original, but this is illogical. The correct answer rearranges the clause to modify only A. Phillip Randolph.
