Which of the following could qualify as a top-down control on a grassland community?

Question

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Grazing intensity by pronghorn antelope is an example of a top-down control because it is a predator-prey relationship where the predator (pronghorn antelope) impacts the abundance and diversity of the plant species (prey) in the community. Limitation of plant biomass due to nitrogen deficiency, influence of rainfall on competition among plants, and influence of shade on the abundance of flowering plants and ferns are examples of bottom-up controls where abiotic factors influence the growth and reproduction of organisms in the community.

Which of the Following Could Qualify as a Top-Down Control