C.Letter C is the Bay Of Bengal
This represents the source of research ideas called classroom lecture.
There are several sources which can inspire and help someone to develop a research question. Some of them are theory, everyday occurrence, serendipity and past research. In this case, Whitney was taught about the bystander effect in her social psychology course and she was inspired to undertake an undergraduate research project on this subject.
Answer:
The use of slave labor majorly impacted the Agricultural Revolution because slaves work was cheap or most of the time free meaning slaves owners made huge profits in the field. The Agricultural Revolution was the time "with many agricultural developments and slave labor help made it all more profitable because they weren't paid for their work."
Hope this helps.