I believe that the best answer for this question is an adjectival prepositional phrase because it describes a noun. It modifies the words "a pygmy hippo," which is the subject of the sentence and therefore a noun. Adjectival prepositional phrases modify nouns, while adverbial prepositional phrases modify verbs, adverbs, or adjectives. Hope this helps.
Answer:
A. Our country can no longer refuse involvement because it can not allow freedom and peace to be at risk.
Explanation:
This excerpt from, "Wilson's War Message to Congress," is clearly discouraging neutrality. Neutrality is the act of not being involved or taking sides in a dispute. Wilson explained that in a world where some governments have made themselves autocratic, thus stifling peace and freedom of citizens, it would be wrong to be neutral, not making efforts to salvage the situation.
Wilson in this paragraph encouraged participation in governance so that citizens can resist actions from the government that are autocratic in nature.
I believe it is B isn't, because if you use the others it most likely sounds like slang.