For gaseous reactions, the rate is expressed in terms of `dP//dt` instead of `dc//dt` or `dn//dt` (where `c` is the concentration and `n` the number of `mol`). What is the relation among these expresisons ?
A. ` (dc)/(dt) = 1/V ((dn)/(dt)) = 1/(RT) ((dP)/(dt))`
B. `(dc)/(dt) = ((dn)/(dt) = ((dP)/(dt))`
C. `(dc)/(dt) = ((dn)/(dt) = 1/(RT) ((dP)/(dt))`
D. None of these