The rate of a first-order reaction is 0.04 mol l -1 s -1 at 10 seconds and 0.03 mol l -1 s -1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is :

1. A. 24.1 s
2. B. 34.1 s
3. C. 44.1 s
4. D. 54.1 s

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