The circuit diagram above contains four ammeters W, X, Y and Z, Which of the following statements about the ammeter readings is correct

A. The reading of W is equal to that of Y and twice that of X
B. The reading of Y is greater than that of Z
C. The readings of W and Y are equal and each is greater than that of X  
D. The reading of Z is equal to the sum of the readings of Y and W

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Correct Answer: C