Chemical Kinetics

Which of the following represents integrated rate law equation for gas phase first order reaction, \(\mathrm{A}_{(\mathrm{g})} \rightarrow \mathrm{B}_{(\mathrm{g})}+\mathrm{C}_{(\mathrm{g})}\)

if \(\mathrm{P}_{\mathrm{i}}=\) initial pressure of \(\mathrm{A}\)

\(\quad\mathrm{P}=\) total pressure of reaction mixture at time ?