Final answer:
The genre that frequently provides an in-depth look into a character's mind is the biography genre, a type of creative nonfiction that focuses on true-life figures and their personal narratives. The correct option is 4) Biography
Step-by-step explanation:
The genre that most often uses the technique of allowing the reader to see into the mind of a character to understand their motivations and desires is the biography genre. While other genres like romance, mystery, and science fiction can give insights into characters' thoughts, it is especially prevalent in biographies and memoirs, which belong to a larger family of creative nonfiction.
These narrative forms offer a detailed exploration of an individual's life, revealing their thoughts and motivations, while drawing from true events rather than purely the author's imagination. In these works, by examining real-life figures and understanding their internal processes, readers are granted the privilege of experiencing the characters' personal narratives closely, thereby getting to know them intimately.