TOEFL Listening: TPO-TOEFL阅读TPO - XC5K3UM15A_TOH3ON$

Which of the sentences below expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information A. The practice of being reflective is no longer simply a habit among teachers but something that is externally motivated. B. Most teachers need to explore ways to form the habit of reflection even when no external motivation exists. C. Many aspects of the motivation to reflect have not been studied, including the comparative benefits of externally motivated and habitual reflection among teachers. D. There has not been enough exploration of why teachers practice reflection as a habit with or without external motivation.