Final answer:
Amy Tan uses her personal experiences with language tests to illustrate how they fail to capture the complexities of language, suggesting they aren't always accurate in measuring language ability.
Step-by-step explanation:
In the excerpt from "Mother Tongue," Amy Tan builds a central idea around the limitations of standardized language achievement tests. Option C is the correct choice: Tan gives an example of her experience with achievement tests to support the idea that they are not always accurate measures of language ability.
She suggests that the tests are too restrictive and do not account for the variety of ways in which language can be understood and used, influenced by cultural and personal factors. Tan's own difficulty with these tests illustrates this point.
For example, Tan's mother's perspective on the potential answers to a fill-in-the-blank sentence completion question demonstrates that real-world language use is often more nuanced than the tests allow. The correct answer is option (c).