A Yazoo Tributary Stream Cannot Join with the Main River

Multiple Choice

A yazoo tributary stream cannot join with the main river in an area because

A) the yazoo flows in a different valley.
B) a small structural ridge separates the rivers.
C) a natural levee on the main river prevents joining.
D) a manmade flow control structure keeps the rivers separate.
E) the velocity of flow in the yazoo tributary is too fast.