Answer:
Social comparison
Explanation:
Social comparison is when a person statutes their own social and personal value by comparing himself to other members of the society. <em>This works as a process to evaluate and know the individual's own attitudes, abilities, characteristics, beliefs, etc.</em>
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A. Virus - flu
B. Fungus - yeast infection
C. Protist - malaria
Usually they start of happy as the person begins to change later on in the relationship
But I am not sure but I think the answer is
C. Happy