Final answer:
The statement from Marx and Engels asserting that the working class is alienated and oppressed supports their view on the negative impact of industrialization on the working class, highlighting the exploitation inherent in the capitalist system.
Step-by-step explanation:
The statement from Engels and Marx that best supports their main claim that industrialization has negative consequences for the working class is: C. "The working class is alienated from the products of their labor and oppressed by the capitalist class." This statement encapsulates the critique of industrial capitalism by Marx and Engels, underlining the exploitative relationship between the bourgeoisie, who own the means of production, and the proletariat, who are compelled to sell their labor in conditions that alienate them from the fruits of their labor and deny them control over their working lives.
Marx and Engels highlight how the proletariat are not merely workers within an economic system, but are subjected to conditions that systematically deprive them of basic human fulfillment and autonomy. This alienation, along with economic exploitation, represents the social cost of industrialization as seen by Marxist theorists, an antithesis to claims of upward mobility or societal prosperity often associated with capitalistic industrial expansion. Thus, the provided statement communicates the core of Marx and Engels' argument regarding the plight of the working class during the era of industrialization.