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
• E.