When he was 6 years old, ron could recite the pledge of allegiance from memory. when ron was 9 years old, he began to understand what the terms pledge and republic meant. finally, at age 12, ron realized the political importance of this pledge. this illustrates the concept of . cognitive developmentb. kinesthetic developmentc. biological developmentd. socioemotional development

This illustrates the concept of COGNITIVE DEVELOPMENT.

Explanation: Cognitive Development is a field in Psychology and Neuroscience that deals with a child's development in mental functions that deals with logic, as opposed to affective which deals with emotions.

This involves learning languages, learning skills, and other aspect of a fully developed brain.

As can be deduced from the Question, he started by recitation, then understanding the meaning of the pledge to then the importance of the pledge. All these are different stages of development.

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the language of nature was a manifestation from god as he said "let there be light" and there was light the world began to assume visible, comprehensible form.

what ever we know now think of the old vision of creation we can be sure that with out the speaking of word -without language- we would have no science today with its striking power to illuminate the world.