Question

which u s. action finally revealed the full horror of the holocaust to the world?
invading poland
ending immigration completely
liberating concentration camps in 1944–45
signing the treaty of versailles

Explanation:

• "Invading Poland" was done by Germany, not the US, so this is incorrect.
• "Ending immigration completely" is not related to revealing the Holocaust's horror.
• When US forces liberated concentration camps in 1944 - 45, the atrocities of the Holocaust were fully exposed to the world through the evidence found in these camps.
• "Signing the Treaty of Versailles" was after WWI and not related to the Holocaust.

Answer:

C. Liberating concentration camps in 1944–45