Correct answer: A. Between capitalists and workers
Explanation: Marx explained capitalist society through the idea of class struggle. The main conflict was between the bourgeoisie, who owned factories, land, machines, and other means of production, and the proletariat, who had to sell their labour to earn wages. Capitalists sought profit, while workers often faced long hours, low wages, insecurity, and poor working conditions. Therefore, option A is correct. Option B describes a political or religious relationship, not the central economic conflict identified by Marx. Options C and D are unrelated comparisons and do not represent the class divisions created by capitalism. The key concept is ownership versus wage labour.