IDENTIFY THE ONE UNDERLINED WORD OR PHRASE- A, B, C OR D- THAT MUST B...

021: Identify the one underlined word or phrase- A, B, C or D- that must be changed for the sentence to be correct.In the northern part of the desert, the dunes are parallel and separating by corridors of low, open shrubland.A. northern part B. the dunes C. separating D. by