Final Answer:
Frederick's troops allowed to cross the Dardanelles in C) Summer 1191. (option C)
Step-by-step explanation:
Frederick's troops were allowed to cross the Dardanelles in the summer of 1191. This pivotal event occurred during the Third Crusade, in which Emperor Frederick I, also known as Frederick Barbarossa, led a large army to the Holy Land. Crossing the Dardanelles marked a significant strategic move in their journey towards the East.
The timing of the crossing was crucial for several reasons. Firstly, crossing in the summer ensured more favorable weather conditions for a military campaign, as the seas were likely calmer, and the overall climate more conducive to troop movement. Additionally, the decision to cross in the summer allowed Frederick's forces to take advantage of the strategic opportunities that this specific timeframe offered for a successful military campaign in unfamiliar territories.
The selection of the correct answer, C) Summer 1191, aligns with the historical context of Frederick Barbarossa's expedition during the Third Crusade. It underscores the importance of considering seasonal factors and strategic planning in medieval military campaigns, shedding light on the complex logistics and decision-making processes involved in historical events.(option C)