The equilibrium constant for a reaction `A+B hArr C+D` is `1xx10^(-2)` at `298 K` and is `2` at `273 K`. The chemical process resulting in the formation of `C` and `D` is
A. exothermic
B. endothermic
C. unpredictable
D. there is no relationship between `K` and `DeltaH`