In transactional analysis, complementary transactions occur when the communication lines are clear and respond in a manner that is expected. Generally, complementary transactions happen when one part of the ego state (Parent, Adult, Child) of one individual engages with the corresponding ego state of another individual.
Looking at the options:
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Child to Adult: This is a complementary transaction, as a child-like message is directed at an adult-like response.
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Child to Child: This is also a complementary transaction, as both parties engage as children.
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Adult to Adult: This is complementary as well, as both are engaging from a rational, adult perspective.
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Child to Parent: This is generally not considered a complementary transaction, as it involves a child communicating to a parent, which could lead to an imbalance or miscommunication if the parent responds from a different ego state (like Adult or Child).
Therefore, the transaction that is NOT complementary is Child to Parent.