Answer:
C. Amygdala
Step-by-step explanation:
The amygdala is one of two almond-shaped nuclei clusters in complex vertebrates, found deep and medium within the temporal lobes of the brain, the amygdalae function independently of the limbic system.
The amygdala is a processing device that is connected from our senses and our internal organs to receive incoming messages. Specific emotional responses are strongly involved, it is responsible for the perception of emotions such as anger, fear, and sadness, as well as the controlling of aggression.
Nadia Seeing the photos of her during her younger age rekindling the emotions of her wedding day most likely activated her Amygdala, which made her to cry joyfully.