A Researcher Follows the Progress of a Reaction and Tabulates $t_{1 / 2}$

A researcher follows the progress of a reaction and tabulates the concentration of the reactant with respect to time of the reaction. How could the scientist prove that the reaction follows first order kinetics and find the rate constant, k? Select all that apply.

A) Impossible to do.
B) Plot a graph of [reactant] against time, and find a constant half-life ( $t_{1 / 2}$ ) .
C) Plot a graph of ln[reactant] against time and get a linear plot.
D) Plot a graph of 1/[reactant] against time and get a linear plot.