Final answer:
If kangaroo rats were killed off and removed from the food chain, the most likely consequence would be that the predators of kangaroo rats would decline in population.
Step-by-step explanation:
If kangaroo rats were killed off and removed from the food chain, the most likely consequence would be that the predators of kangaroo rats would decline in population (option B).
Kangaroo rats are an important food source for predators like hawks and snakes. Without the rats, these predators would have less food available and their populations would likely decrease over time.
This disruption in the predator-prey relationship could have cascading effects on the entire ecosystem, leading to changes in the abundance and distribution of other species as well.