Which right prevents child labour

Which of the following was discovered in the piedmont region of north carolina in 1799?

Awaiver of the requirement for documentation of informed consent may be granted when: the investigator has no convenient place to store signed consent forms separate from the research datathe only record linking the subject and the research is the consent document and the principal risk is a breach of confidentiality.potential subjects might find some of the research questions embarrassing, personal, or intrusivethe subjects are literate in their own language; however, they do not read, write, or speak english

Why did lincoln inform the confederacy that he would not e sending troops or weapons as food supplies were sent to fort sumter?