Kemal Atatürk gained control of Turkish forces during the fight for independence primarily through his efforts to rally nationalist support and combat foreign influence following World War I. The most accurate response would be:
Forces joined him after being inspired by his efforts to fight European powers in World War I.
This reflects how Atatürk's leadership and his vision for a sovereign and modern Turkey aligned with the aspirations of various military and civilian groups who were disillusioned by the post-war occupation of Turkey and the actions of the sultan.