In nitration of benzene by mixed acid the rate of reaction will be:
A. `C_(6)H_(6) = C_(6) D_(6) = C_(6) T_(6)`
B. `C_(6) H_(6) gt C_(6) D_(6) gt C_(6) T_(6)`
C. `C_(6) H_(6) = C_(6) D_(6) gt C_(6) T_(6)`
D. `C_(6)H_(6) lt C_(6) D_(6) lt C_(6) T_(6)`