What has happened to second language learning in recent years?（）。

• A.A shift from concern with the teacher to an interest in the method.<br/>
• B. A shift from concern with the textbook to an interest in the learner.<br/>
• C. A shift from concern with the acquisition process to an interest in the learner.<br/>
• D. A shift from concern with the learner to an interest in the teacher.<br/>

正确答案：B