This question is wrong, because there are in fact four abstract nouns in
this sentence, two of which can be found among your options. An
abstract noun is something that you cannot touch, because it doesn't
have a form - those are words such as love, hatred, happiness, etc. So,
here, among these examples, abstract nouns are both A. justice, and D.
pursuit. However, if you only have to choose one, I'd go with A.
justice, because I believe that is what your teacher wants you to pick.
B. is a verb, and C. is a proper noun, not an abstract one.
The linking verb in this sentences is Stayed
It is the only verb in the sentence so it is the only thing that can be a linking verb.
The answer is D. Because the other answer have dependent marker words such as Do and After.