For the homogenous gaseous reaction `Ato3B`, if pressure after time t was `P_(t)` and after completion of reaction, pressure was `P_(oo)` then select correct relation
A. `k=(1)/(t)"in"((P_(oo))/(3(P_(oo)-P_(t))))`
B. `k=(1)/(t)"in"((2P_(oo))/((P_(oo)-P_(T))))`
C. `k=(1)/(t)"in"((3P_(oo))/(2P_(oo)-P_(t)))`
D. `k=(1)/(t)"in"((P_(oo))/(3(P_(oo)-P_(T))))`