The Wilmot Proviso was a proposed amendment to a military appropriations bill that would

Aregulate competition between free and slave states.
Bpermit the slavery issue to be determined by popular sovereignty.
Cestablish slavery in the territories acquired from Mexico.
Dban slavery in territories acquired from Mexico.

Verified Answer :

The Wilmot Proviso was a proposed amendment to a military appropriations bill that would "d. ban slavery in territories acquired from Mexico," since this was one of the many plans that tried but failed to avert civil war.