Based on the passage, the thing which made Johnson’s dictionary innovative is:
Based on the complete text, we can see that there is the narration about Johnson's dictionary and how innovative it was for its time because it was not done before.
With this in mind, we can see that the main thing which made the dictionary to be innovative was that it was the first dictionary that made use of quotations to trace word usage from authoritative writers.
Therefore, the correct answer is option C
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