As concerned citizens continue to investigate the activities of the CI

As concerned citizens continue to investigate the activities of the CIA, their surprising similarity to Russias infamous KGB has become impossible to ignore.

(A) their surprising similarity to Russias infamous KGB has become
(B) the surprise of their similarity to Russias infamous KGB has become
(C) the surprising similarity between them and Russias infamous KGB has become
(D) the surprising similarity between the CIA and Russias infamous KGB becomes
(E) the surprising similarity of the CIA with Russias infamous KGB becomes