O A A puppy growing into an adult dog. OB A rabbit running away from a fox.
O C Bacteria becoming resistant to an antibiotic.
D Deer grazing on grass.

The rate that would change would be the  searching efficiency/attack rate. there are only two other rates in this model: the  growth rate of prey, and the  predator or consumer mortality rate.the  searching efficiency/attack rate is what indicates how effectively can a predator capture its prey whether in the searching process or actual capturing/attacking process.