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Which one is more appropriate?( only the most appropriate is the right answer)

Who informed you about the matter ?
Who informed you of the matter? 

which preposition is more proper than other to use after "inform" in the exam?

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Inform is used with both of and about. So they both are correct. Here are more examples taken from different dictionaries:

  1. Why wasn't I informed about this earlier?
  2. Walters was not properly informed of the reasons for her arrest.
  3. It is with great sorrow that I inform you of the death of our director.
  4. Companies publish annual reports to inform the public about the previous year's activities.
  5. ...efforts to inform young people about the dangers of drugs.
  6. We will immediately inform you of any changes to the programme.

Note that of sounds a bit more formal.

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