Which description of this map is correct?

A.
Letter W represents the location of the Huang He, while letter X represents the location of the Chang Jiang.

B.
Letter X represents the location of the Huang He, while letter W represents the location of the Chang Jiang.

C.
Letter Y represents the location of the Huang He, while letter Z represents the location of the Chang Jiang.

D.
Letter Z represents the location of the Chang Jiang, while letter Y represents the location of the Huang He.

There is not enough information provided to determine the correct description of the map. The letters and their corresponding locations on the map are not specified.