WAIT WHY WAS HIS ACCOUNT DELETED
I believe the answer is C) frightened. A participle is a word formed from a verb, and used an an adjective or a noun. Since frightened and climbed are both verbs, that narrows it down to either C or D. From there, frightened is an adjective, while climbed is nor an adjective or a verb.
Answer: The Mind of a Hero
Explanation: the title suggests that the book is going to take a closer look into a hero’s mind, which means that they are going to further study this character.