1. What agricultural invention, designed to increase production, had the effect of increasing the number of slaves needed for labor in the deep South?
O A. the wheat reaper
O
B. the cotton gin
OC. the steel plow
OD. the rice mill

Francine, a college freshman, has agreed to participate in a psychology research study. before she begins her participation, she reads a statement written by the researcher explaining the purpose of the research and the potential risks of participation. it also explains that francine is free to withdraw from the research at any time. in providing francine with this statement, the researcher has followed the ethical guidelines of for participants.