Answer:
The correct answer is Tan discusses her mother’s use of English to build the idea that a form of language can be purposeful and meaningful even if it is nonstandard.
Step-by-step explanation:
This excerpt shows how Tan feels guilty in saying that his mother's English is "broken" or "fractured." The guilt she feels shows us that she really does not want to use those terms, because in any case her mother's language, although it does not meet the grammatical standards of conventional English, still has the same meaning and achieves the same purpose.
You don't need to speak perfectly so that your words are useful and understandable.
With this, Tan builds the central idea of the story.