Text stimulus (diagram): Two-axis concept diagram titled 'Understanding Race'. Horizontal axis label 'basis of category' with left endpoint 'fixed biology claim' and right endpoint 'historically changing classification'. Vertical axis label 'social effect' with bottom endpoint 'no social consequences' and top endpoint 'real social consequences'. Four quadrants are blank except small letters A, B, C, D placed clockwise starting upper left. The horizontal axis runs from 'fixed biology claim' to 'historically changing classification'; the vertical axis runs from 'no social consequences' to 'real social consequences.' Which quadrant best represents the target skill?