Respuesta :
Anxiety would be my best guess on this one and it is a synonymal relationship
meaning they go together
The word anxiety will be analog to stress, it reveals cause and effect relationship.
What is an analogy?
Correspondence or partial similarity is referred to as analogy.
The given scenario shows analogy between drink and hydration and stress and anxiety.
As stress leads to anxiety immediately, it can be called as a cause and effect relationship.
Thus, the word that is completing the analogy is anxiety and the relationship is cause and effect.
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