Answer:
a. Because the presence of slaves as free labor depressed wages for white workers
Step-by-step explanation:
David Wilmot was a united states senator and a judge of the Court of Claims.In 1846 he sought to ban the slavery because of the presence of slaves who could work as free labor and they provide lower wages to the white workers. Though it was a failed attempt to ban slavery but he tried and later the slavery was banned by Abraham Lincoln.