The equation of state of some gases can be expressed as \[\left( P+\frac{a}{{{V}^{2}}} \right)\,(V-b)=RT\]. Here \[P\] is the pressure, \[V\] is the volume, \[T\] is the absolute temperature and \[a,\,b,\,R\] are constants. The dimensions of \['a'\] are [CBSE PMT 1991, 96; NCERT 1984; MP PET 1992; CPMT 1974, 79, 87, 97; MP PMT 1992, 94; MNR 1995; AFMC 1995]

• A.             \[M{{L}^{5}}{{T}^{-2}}\]          
• B.             \[M{{L}^{-1}}{{T}^{-2}}\]
• C.             \[{{M}^{0}}{{L}^{3}}{{T}^{0}}\]      
• D.             \[{{M}^{0}}{{L}^{6}}{{T}^{0}}\]