What Was President James Polk's Role in the Controversy Surrounding

What was President James Polk's role in the controversy surrounding the Wilmot Proviso?

A) He pushed Congress to pass it because he believed it would help keep the Union together.
B) He enthusiastically supported it in order to protect the interests of slaveholders and the economy.
C) He dismissed it as an attempt to contain slavery and argued it was unrelated to the Mexican-American War.
D) He blamed the South for the Mexican-American War and saw it as a way to punish southerners.
E) He argued against it so persuasively that Wilmot's idea would have little influence on the Civil War.