Without seeing the actual cartoon, I would suggest that if the sinking ship symbolizes a significant change in the war dynamic, options A or D could be most appropriate, depending on the context of the cartoon.
- If the cartoon emphasizes Russia's exit and its impact on the war, then A would be correct.
- If the focus is on the U.S. becoming more involved in the war, then D would fit better.
However, if the cartoon critiques the effectiveness of the Allies as a whole, B could also be a possibility.
Consider the specific imagery and text in the cartoon to determine the most accurate interpretation.