I am sure the answer is B.
The answer is B because "The Cry of The Children" because this poem promotes regulations on child labor, which is an example of social justice.
It's an adjective; "The smallest puppy" is the subject of the sentence as the rest of the sentence describes it. Of course the subject cannot just be "puppy" so it must include "The smallest" as well. Since smallest is an adjective (A word that describes something else,) that answer is Adjective.