d. Acheson praised the president’s defense of democratic institutions in the place that did not know democracy.
Explanation:
Dean Acheson was United States of American' Secretary of State under Truman Administration. He was widely known for defining U.S foreign policy during the cold war.
Meanwhile, Dean Acheson’s speech to the Delta Council in 1947 was considered as ironic because, he gave speech on aiding "free peoples" to the Delta Council, where he talked about Civil Rights and how those people should exercise their liberties, but people from Delta did not have those rights because they were segregated by the segregation policy from that time, which implies that, the Delta's citizens were denied the very liberties of which he spoke.
Hence, the right answer is Acheson praised the president’s defense of democratic institutions in the place that did not know democracy.