Why Have Norms Against Child Labor NOT Been Universally Adopted

Why have norms against child labor NOT been universally adopted?

A) Child labor is not morally problematic.
B) The alternatives for the children in poor areas are sometimes worse than the status quo.
C) Schools tend to be useless in developing countries and not worth the time of the children.
D) There has not been enough effort by international organizations to get child labor banned.
E) Consumers tend to be fine with buying products made by child labor.