From Nick's story (para. 11) , we know that _________________.
A.
Nick is not as smart as his siblings and lags behind in acquiring his mother tongue.
B.
Nick cannot produce the sentence "I want milk" clearly no matter how many times the author has tried to teach him how to say these three words.
C.
Nick is an exception to the traditional patterns and phases of acquiring L1.
D.
Researchers are wrong about different stages of mastering the native language.