Which of the following holds good for an elementary reaction as shown in the bellow figure ?
A. The rate of disappearance of Y is equal to the rate of disappearance of X
B. The rate of disappearance of X is equal to the rate of appearance of Z
C. The rate of disappearance of Y is equal to the rate of appearance of Z
D. Three times the rate of disappearance of X is equal to the rate of appearance of Z
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