The parts of personality included in the proprium are

A) developed gradually over four stages.
B) unique to the individual.
C) determined by instinctual forces.
D) restricted to unconscious factors.

The proprium, also known as the self or ego, is unique to the individual and consists of the core aspects of personality that define who we are as individuals. It includes our sense of identity, values, and self-esteem. Unlike instinctual forces, it is not determined by biological or innate factors. It is also not restricted to unconscious factors, as it is accessible to our conscious awareness. While the proprium does develop over time, it is not in four distinct stages but rather through a process of integration and consolidation of experiences over the course of the lifespan.