What were the events that led the members of the Albany Congress to believe that a plan of union was necessary? Choose the correct option:

A) The French and Indian War, which highlighted the need for a unified defense against French forces.
B) The Proclamation of 1763, which restricted westward expansion and required a coordinated approach to dealing with Native American tribes.
C) The ongoing conflicts between the British colonies, such as the border disputes between Pennsylvania and Maryland.
D) The increasing tensions with Native American tribes, which required a unified approach to negotiations and defense.