Answer:
The transition word in this passage is "but." Transition words (or phrases) connect ideas in writing, helping the writer follow a train of thought. They ease the transition between different statements, and when used properly, make reading easier. In this case, Janeczko brings the reader along from noting a state of peace between two factions to remembering that the peace did not eradicate suspicion.
Explanation:
The answer is but
The evidence that supports that "black holes are incredibly powerful cosmic forces" are A and C. The other two do not have any say on how powerful a black hole is.
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