I would say C. Chatter always was talking quickly to someone, and communication is anyway humans interact. (Speaking, writing, sharing ideas)
Answer:
comparative of far is farther or further.
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The author may have presented that the development of personality is complex, showing how there are many elements acting in this development and countless elements that can modify this development at any time. To illustrate this, the author can make a comparison between personality development and a complex system, such as the development of a plant or an embryo for example.
