The acid catalyzed hydrolysis of an organic, compound 'A' at \[30{}^\circ C\] has a time for half change of 100 minute when carried out in a buffer solution at \[(pH=5)\] and 10 minute when carried out at \[(pH=4)\]. Both times of half change are independent of the initial concentration of A. If rate constant K is defined by \[\frac{-d[A]}{dt}=K{{[A]}^{a}}{{[{{H}^{+}}]}^{b}},\] the values of a and b respectively are

• A. 1, 1
• B. 1, 2
• C. 0, 1
• D. 1, 0