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.
The answer for #35 is A) lived a man as big as a barge. And i think #36 is C)Simile. Hope this helps!
The simple subject of this sentence is Matt Robins.
1. an essay about feminism in the twentieth century
2. The Washington Post was awarded four Pulitzer Prizes in 2010