Answer:
b. The number of cactus plants would increase.
Step-by-step explanation:
Food chain is defined as a linear netwrok between producer and high level predators of environment and shows the flow of energy between them.
Kangaroo rats are rodents which lives in desert and feed over cactus plants, grass and other isects for their survival. If kangaroo rats will be removed from the food chain, the number of cactus plants will increase as kangaroo rats will not be there to feed them and number of snakes will decrease as snakes may die as they feed over kangaroo rats.
Hence, the correct option is b.