Answer:
In 1754, the French built Fort Duquesne where the Allegheny and Monongahela Rivers joined to form the Ohio River (in today's Pittsburgh), making it a strategically important stronghold that the British repeatedly attacked.
Explanation:
I think the correct answer is C
If this is on Odysseyware The answers are
They were not able to rest or reinforce.They were running out of supplies and food.Their defensive positions each time were poor.