We can infer from the excerpt is that Tan believes that achievement tests give inadequate measurements of language ability.
Excerpt is a short part of any text, music, or piece of writing. In English excerpts are given and based on that excerpt questions are made to answer.
The excerpt is taken from Mother tongue by Amy Tan, in which the story of people with different language in America is given. Americans don't like people with other languages.
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Thus, the correct option is C, Tan believes that achievement tests give inadequate measurements of language ability.
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