What Were the Main Groups in Politically Fragmented Iraq Post

What were the main groups in politically fragmented Iraq post the U.S. conquest?

A) Shias in the south, Sunni Arabs in the center, and Kurds in the north
B) Shias in the north, Sunni Arabs in the center, and Kurds in the south
C) Sunni Arabs in the north and Shias in the center
D) Sunni Arabs in the center and Shias in the south
E) Shias in the south and Kurds in the north