Mastery of pragmatics allows children to change styles of speech, or "codes," depending on the audience. what code are children likely to use with their peers? informal code formal code moderate code extreme code

I believe the answer is: formal code
formal code refers to the type of code that derived from authority.
For children this authority came from their parents.
And when they communicate with their friends, the language that they used is most likely the type of language that their parents allow them to use at home.

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