According to freud, the develops around age 2 or 3 and us acknowledge what is right and what is wrong.

The right answer is the superego. The superego is a psychic entity proposed in the psychoanalysis theory of Sigmund Freud. He postulates that the human mind possesses three psychic entities that are antagonistic to each other, in various situations throughout life they come into conflict and from the resolution of those conflicts our behavior takes place. The 3 entities are the id, the ego, and the superego. The superego directs the principle of morality and compliance with the rules.

I hope my answer can help you.

The repetition of initial consonant sounds is called alliteration