Celia is motivated to join a support group after her husband died in order to meet others who understand what she is experiencing. this is the result of a motivation related to

 This is the result of a motivation related to: Emotional regulation

Emotional regulation is a complex process that is caused by specific states within a specific period of time that could influence one's behavior.
In this case, the complex process is triggered by the death of her husband and it influences Celia to find an emotional comfort within like-minded groups.

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