【单选题】What is the main meaning of part 3 (14-17paragraph)?
A.
The students should not be blamed for their language deficiency for two reasons and author expresses his opinion about the importance of grammar and vocabulary.
B.
This part introduces the background of the story and represents the thesis statement: students unfairly bear the a lot of criticism for these language deficits.
C.
The author narrates another incident where his son unconsciously utter a grammatically perfect sentence with subjunctive mood, from which the author draws the conclusion of narrative.