Science is a sort of news agency comparable ___ to other news agencies.
Explanation:
In terms of general rules, science as a news agency is comparable to other news agencies. ‘principal’ means ‘chief’ and this is not the meaning that the sentence is trying to convey, so (a) and (c) are wrong. ‘in spirit and form’ also sounds directionless, when the sentence is saying that the underlying values are the same.
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