At which condition molar flux with respect to a stationary observer and with respect to an observer moving with molar average velocity?

In a highly concentrated solution

At which condition molar flux with respect to a stationary observer an

1.	At which condition molar flux with respect to a stationary observer and with respect to an observer moving with molar average velocity?
A.	In a very dilute solution
B.	In a highly concentrated solution
C.	At moderate concentration
D.	Never
Answer» B. In a highly concentrated solution

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