Answer: D. Superego
Explanation:
The SUPEREGO is the moralistic part of the psyche. It includes the values and morals in society that we learn from parents as well as others and develops in the phallic stage of psychosexual development.
The SUPEREGO tries to control the impulses of the more deviant ID and persuades the EGO to engage in moralistic actions.
This is why Deepak reflecting on the lessons his parents has taught him and switching to more moral actions are coming from the SUPEREGO.