Question

why did allied forces find so much destruction when they finally reached germany?
german troops had destroyed the country to prevent the allies from finding supplies.
german civilians had been rioting to protest the war and the actions of the nazi regime.
german cities and factories had been destroyed by the many battles between ground troops.
german cities and factories had been destroyed by an ongoing allied bombing campaign.

Explanation:

During World War II, the Allied forces carried out a massive bombing campaign against Germany. This campaign targeted German cities and factories, causing extensive destruction. German troops did not destroy their own country to prevent Allies from finding supplies. German civilians rioting to protest the war and Nazi regime actions was not the main cause of the large - scale destruction. Battles between ground troops also contributed to some destruction but the ongoing Allied bombing campaign was a major factor.

Answer:

German cities and factories had been destroyed by an ongoing Allied bombing campaign.