The rate constant of a reactant is `1.5 xx 10^(-3)` at `25^(@)C` and `2.1 xx 10^(-2)` at `60^(@)C`. The activation energy is
A. `(35)/(333)R log_(e).(2.1 xx 10^(-2))/(1.5 xx 10^(-2))`
B. `(298 xx 333)/(35)R log_(e). (21)/(1.5)`
C. `(298 xx 333)/(35)R log_(e) 2.1`
D. `(298 xx 333)/(35) R log_(e).(2.1)/(1.5)`