What Was So Ironic About Dean Acheson's Speech to the Delta

What was so ironic about Dean Acheson's speech to the Delta Council in 1947?

A) Acheson praised the president's defense of democratic institutions in the place that did not know democracy.
B) Acheson was urging the gathering of cotton planters to automate production, while the Democrats were pushing for fair wages for black farmworkers.
C) Acheson was delivering a speech meant for new African-American Democrats in Mississippi to a gathering of white supremacists.
D) The Under Secretary of State was warning the same audience against the Cold War that had already heard Churchill's "Iron Curtain" speech a month prior.