Answer:
C). It expresses the many types of English the Tan family uses.
Step-by-step explanation:
'Mother Tongue' by Amy Tan primarily intends to reflect the another side or view of the 'imperfection or limitations of a language like English' and reflect the struggle faced by Asian Americans to adapt the language. She portrayed that such imperfections could lead to enhance the richness of the language which contradicted the existing stereotypes of the society.
As per the question, Tan's mother thinks that it was effortless to read that book as 'it(the book) expressed the different types of English the Tan family uses'. These words are associated with their cultural background and hence, would be easy to read and learn. Thus, option C is the correct answer.