单选题 2分

As for a lesson plan,a teacher says,"When do lesson planning,I always prepare some extra?and alterna...

As for a lesson plan,a teacher says,"When do lesson planning,I always prepare some extra?and alternative tasks and activities so that I have the options to cope with the unexpected situations."
According to the teacher′s words,we can know that the teacher follows the principle of__________in?lesson planning.
  • A.linkage
  • B.variety
  • C.flexibility
  • D.learnability