For the reaction shown below,

the value of k1 is 1 × 10-4 s-1. If the reaction starts from X, the ratio of the concentrations of Y and Z at any given time during the course of the reaction is found to be $$\frac{{\left[ {\text{Y}} \right]}}{{\left[ {\text{Z}} \right]}} = \frac{1}{4}.$$ The value of k2 is
A. 1 × 10-4 s-1
B. 2.5 × 10-5 s-1
C. 4 × 10-4 s-1
D. 3.5 × 10-4 s-1
Answer: Option C

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