Final answer:
Civilian advocacy groups are the primary channel for correcting discriminatory practices and for communication on equal opportunity matters.
Step-by-step explanation:
The primary channel for correcting discriminatory practices and for communication on equal opportunity matters is the Civilian advocacy groups. Civilian advocacy groups play a crucial role in addressing and challenging discriminatory practices through awareness campaigns, lobbying efforts, and legal actions. They work to promote equality and advocate for the rights of marginalized groups. For example, organizations like the American Civil Liberties Union (ACLU) and the National Association for the Advancement of Colored People (NAACP) have been instrumental in fighting for civil rights and challenging discriminatory practices.