What Were Freedmen's Conventions

What were freedmen's conventions?

A) Secret meetings held by freedmen in the South primarily to discuss religious freedoms
B) Whites-only statewide government gatherings organized under President Johnson's plan
C) Meetings and marches in which freedmen demanded citizenship, civil rights, and land
D) Formal assemblies where freedmen cast their first ballots and exercised their right to vote
E) National protests for freedom for blacks that primarily took place in the North