Astress-moderating hormone released by cuddling and associated with pair-bonding is known as:

The hormone Oxytocin is released during positive physical contact between humans. It creates a stress lowering reaction and increases bonding between the parties. This creates attachment, and the effect is present in all types of human relationships, ranging from the bond between mother and child to romantic couples.

The answer is d. when it begins to fall back to the child's hand