Which of the following was a serious problem for U.S. troops as they began Operation Torch?Food suppliesGerman aggressionInexperienceFuel supplies

The question is asking about the serious problem faced by U.S. troops during Operation Torch. Operation Torch was the British-American invasion of French North Africa during the North African Campaign of the Second World War which started on 8 November 1942.

The options given are:

1. Food supplies
2. German aggression
3. Inexperience
4. Fuel supplies

To answer this question, we need to understand the context of Operation Torch. The operation was launched from the United Kingdom and aimed at the western part of North Africa. The main challenges faced by the U.S. troops were not related to food or fuel supplies, as these were well managed by the Allied forces.

The German aggression was indeed a problem, but the U.S. troops were prepared for this and had the support of the British forces.

The most serious problem for the U.S. troops as they began Operation Torch was their inexperience. This was the first time American troops were involved in such a large-scale overseas operation, and they lacked experience in combat and warfare strategies compared to their German counterparts. Therefore, the correct answer is "Inexperience".