A person who pretends to have more knowledge or skill than he really has:

Answer: Option D

The one word substitution is Charlatan.

Crook : a person who is dishonest or a criminal.
Apotheosis : the elevation of someone to divine status.
Renegade : a person who deserts and betrays an organization, country, or set of principles.
Charlatan : a person falsely claiming to have a special knowledge or skill.