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))=(V)/(RT)((dP)/(dt))`
D. None of these