A 4-year-old girl frequently tells her father he is her 'boyfriend' and insists on sitting between her parents. She also expresses frustration and jealousy when her mother receives affection from her father. According to psychodynamic theories of development, which of the following concepts best explains this pattern of behavior?

A five-year-old girl frequently tells her mother, 'When I grow up, I'm going to marry Daddy.' She often insists on sitting between her parents and shows jealousy when they are affectionate with one another. Within the framework of psychodynamic theory, which of the following concepts best explains this pattern of behavior?