D. Because many still thought of themselves as British
Explanation:
Every colony had a volunteer army which was comprised of farmers and untrained men. The states had not many regular variables pulling them together as a unit. To battle against the British implied battling without the military that they once had a place or battling with men that were untrained. Men were approached to join colonial militias armies which expected them to leave their fields and work to battle for a perilous reason against the British.