Final answer:
Frederick Barbarossa is estimated to have had about 100,000 soldiers at his disposal during the Third Crusade, with this figure being the most accepted among historians. The answer to the question is B) 100,000.
Step-by-step explanation:
The question revolves around the historical figure Frederick Barbarossa, who was a Holy Roman Emperor from 1155 until his death in 1190. It is likely referring to the forces he had during the Third Crusade. Exact numbers for medieval armies are often subject to historical debate due to the lack of precise records. However, the most reliable estimates for the number of soldiers at Frederick Barbarossa's disposal during his campaigns would be closer to 100,000. While some sources might cite different numbers, this figure is commonly accepted among historians as a reasonable estimate for the size of his force. Therefore, the answer to the question is B) 100,000.