Your question does not provide enough information. I suggest you attach an image file down below.
Answer :
D. The sentence which best states the controlling idea of this passage is "The wire taps were never a secret, but they helped the United States gain military intelligence.
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The following excerpts from the passage reaffirm this controlling idea :
1. "On balance, however, some valuable information was gathered from the tapped conversations. The U.S. learned, for example, a great deal about the Soviet and Eastern European order of battle, or its military organization. Others feel that the intelligence was valuable to check against similar information obtained from other sources."
2."The evidence suggests that the CIA gained two invaluable and untainted kinds of knowledge from the taps. The agency learned a basic blueprint of the Soviet and East German security systems, and it never picked up a glimmer of warning that Moscow intended to go to war.”
Answer: It's B
Explanation: third does not make sense, and a does not follow the pattern
