請教黃金閱讀REFLECTION IN TEACHING的插入句題 - 英檢

又是一題問題，麻煩大家了…謝謝

原文:
Paragraph 4 Helping this group of teachers to revise their thinking about
classroom events became central. ■This process took time and patience and
effective trainers. ■The researchers estimate that the initial training of
the same teachers to view events objectively took between 20 and 30 hours,
with the same number of hours again being required to practice the skills of
reflection.

Paragraph 5 ■Wildman and Niles identify three principles that facilitate
reflective practice in a teaching situation. ■The first is support from
administrators in an education system, enabling teachers to understand the
requirements of reflective practice and how it relates to teaching students.
The second is the availability of sufficient time and space. The teachers in
the program described how they found it difficult to put aside the immediate
demands of others in order to give themselves the time they needed to develop
their reflective skills. The third is the development of a collaborative
environment with support from other teachers. Support and encouragement were
also required to help teachers in the program cope with aspects of their
professional life with which they were not comfortable. Wildman and Niles make
a summary comment: "Perhaps the most important thing we learned is the idea
of the teacher-as-reflective-practitioner will not happen simply because it is
a good or even compelling idea."

插入句:
However, changing teachers’ thinking about reflection will not succeed
unless there is support for reflection in the teaching environment.


這題正確答案是插入第三個，可是我還是無法看出其關連性…
所以請教各位為什麼呢??

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