The result of general edward braddock's effort to capture fort duquesne was: select one: a. a prolonged and successful siege b. braddock's promotion to governor of virginia c. a devastating ambush and defeat d. french withdrawal from the ohio valley e. a conventional european-style battle

I believe the answer is: c. a devastating ambush and defeat  

This failure happened during the seven years war. He led the expedition to capture fort duquesne. He was not prepared for the british army's excellent positioning on the river,which caused many of his soldiers to flee and caused him a devastating defeat.

i honestly have no idea