Although Planet X has yet to be discovered, Brown and Batygin both have “good evidence” of its existence. How do they describe Planet X?

C) reflection (i also looked up the other choices just to make sure)

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.