Answer: OC, "The internal management of the Central Intelligence Agency [CIA] is being reorganized."
Explanation: Process of elimination
OA, you don't need brackets and parentheses.
OB, you don't start with parentheses and end with a bracket.
OD, [sic] means that something is misspelled, but is a part of the quote. I found nothing misspelled, so unless something is, the answer is OC.