The maxim “from concrete to abstract” advises teachers to begin with tangible,observable examples before moving to symbolic or theoretical descriptions. Real objects and models give learners direct experience that helps them understand later abstract ideas. The stem explicitly describes this sequence,so concrete is the correct word.
Option A:
Whole appears in the maxim “from whole to part,”which concerns presenting an overview before analysing components and is different from concrete experiences.
Option B:
Complex is part of the maxim “from simple to complex,”which deals with difficulty level,not with tangibility.
Option C:
Concrete refers to real and specific materials that can be seen or handled,which perfectly matches the use of objects and models.
Option D:
Unknown would belong to the maxim “from known to unknown,”which focuses on familiarity rather than concreteness,so it is not appropriate here.
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