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Of the 4, this option is the best justification for the use of child labor during the Industrial Revolution: 1) You could pay a child less and save money because children were doing less intensive work; 2) Children were more compliant that adult labor; 3) The physiology of a child was advantageous for all aspects of industrial labor; 4) Children were used as labor on family farms. Therefore, it was normal to have children as labor, even if the work was different.
What is 4) Children were used as labor on family farms. Therefore, it was normal to have children as labor, even if the work was different.