The Kinetics of the Reaction Were Studied and the Following

Multiple Choice

The kinetics of the reaction were studied and the following results obtained,where the rate law is: For a run where [A]₀ = 1.0 $\times$ 10^-3 M and [B]₀ = 5.0 M,a plot of ln [A] versus t was found to give a straight line with slope = -5.0 $\times$ 10^-2 s^-1.
For a run where [A]₀ = 1.0 $\times$ 10^-3 M and [B]₀ = 10.0 M,a plot of ln [A] versus t was found to give a straight line with slope = -7.1 $\times$ 10^-2 s^-1.
-Calculate the value of k (ignore units) .

A) 22
B) 10
C) 50
D) 1.1
E) none of these