In 2010, the United States Publicly Apologized to the Nation

In 2010, the United States publicly apologized to the nation of Guatemala when it was discovered that in the 1940s, U.S.government ______.

A) researchers knowingly injected Guatemalan patients with live cancer cells
B) researchers conducted human radiation experiments on Guatemalans
C) officials knowingly donated tainted canned food rations to the Guatemalan government, exposing thousands of Guatemalans to botulism
D) researchers deliberately infected hundreds of Guatemalan mental patients with gonorrhea and syphilis