The answer is D: “The attempts of the proletariat to rise above this abasement”.
Engels was a German writer and philosopher very well-known for having co-written the Communist Manifesto alongside Karl Marx.
The foundation of his political and economic thinking was that the working conditions of the labor power were unacceptable under the rise of early capitalism and needed to be changed so that the laborers could benefit from the fruits of their own labor. His claims was that society as a whole needed to improve these conditions so that the proletariat, rightfully, could “rise above this abasement”, meaning, their unjust working and living conditions.