For a first order homogeneous gaseous reaction
`Ato 2B+C`
if the total pressure after time t was `P_(1)` and after long time `(t to infty)` was `P_(infty)` then K in terms of `P_(t_(1))` `P_(infty)` t is
A. `k=(2.303)/(t)log((Poo)/(Poo-P_(t)))`
B. `k=(2.303)/(t)log((2Poo)/(Poo-P_(t)))`
C. `k=(2.303)/(t)log((2Poo)/(3(Poo-P_(t))))`
D. none of these