The pressure and density of a diatomic gas \[(\gamma =7/5)\] change adiabatically from (P, d) to (P', d'). If \[\frac{d'}{d}=32\], then \[\frac{P'}{P}\] should be [CPMT 1982; EAMCET 2001]

• A.   1/128   
• B.   32
• C.   128
• D.   None of the above