Please elaborate on your question
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.
I don’t know if you did this already but i hope i can help (: alright let’s do this do you know what genres you want ? i can help after if you want