Final answer:
The finding that supports detracking efforts the most is the disparities in educational opportunities, as it highlights how tracking can perpetuate inequalities.
Step-by-step explanation:
The question asks which finding adds momentum to the effort to detra. Conflict theorists argue that tracking can create self-fulfilling prophecies where students achieve according to expectations set for them.
Considering the provided context, option D) Disparities in educational opportunities supports the notion of detracking, since tracking can perpetuate inequalities in education and detracking aims to address and reduce such disparities. The added momentum to detrack would come from the desire to provide equal educational opportunities to all students, regardless of their initial performance level.