B. Looking under the heading "awards" in a reference book about the military
Answer:
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A, In Fact, studies by scientists have found......
In fact followed up by an actual factually proven statement!
The word pair that would be best to complete the analogy: emblem:insignia is the guard:sentinel. An analogy is a similarity of both things. The words guard and sentinel share the same meaning just like the analogy; emblem:insignia. The answer is the analogy guard:sentinel.
D............................