Mother Jones: Fierce Fighter For Workers' Rights by Judith Pinkerton Josephson

What is most likely the author’s purpose for including paragraph 4 in the excerpt?

A. To point out how skilled the children were at the jobs they held in the factories

B. To emphasize the poor pay that the children received for the hours they worked

C. To encourage children to be more careful when working with powerful machinery

D. To show the effect that factory jobs had on the health and wellness of child workers