单项选择题

By saying that" to acquire the right accent.., hardly ever occurs" ( Lines 9-10, Para. 2 ), the author means that ______.

A.one cannot distinguish his mother tongue from a new language
B.one cannot speak a new language in exactly the same way as the natives
C.one cannot speak a new language as fluently as the natives
D.one cannot speak a new language as correctly as the natives