Answer:
C. increased child labor
Step-by-step explanation:
With industrialization, the specialized worker was rarely needed and the salaries became lower and lower everyday. With that, workers could not support their families anymore and all the family had to start working. Eventually, even the children had to work in order for the family to have money to survive. This sort of child labor still happens today in many countries (in China for example, it wasn't that uncommon a while ago. Some say even today).