The Author of Your Text Refers to "Unwritten Plans for and Approaches

The author of your text refers to "unwritten plans for and approaches for learning." What is she referencing?

A) the lesson plans made by the teacher before the formal classroom time
B) the interactions between adult and children, where the greatest learning takes place
C) the lesson plans teachers make "on the fly," responding to changes in the classroom environment
D) plans for addressing each child as a "whole child"