[单选题]
In a first order reaction,awmu5jw2l5q 395n;k tp7dy lu 9 t9sz. )gu umj(y8cyn0pue3 b the concentration [A] of a given reactant can be determined at time .9j9ze)s 8yt ubmcupu(gn 0 3yt, according to the equation below, where [A]$_o$ is the initial concentration of A and k is the rate constant.
ln[A]=-kt+ln[A]$_o$
A. Independent variable
B. Dependent variable
C. y-intercept
D. Gradient
