What would MOST LIKELY happen if gazelles were removed from this ecosystem?

A. The populations of lions and zebras would increase.

B. The populations of lions and zebras would decrease.

C. The populations of hyenas and grasses would increase.

D. The populations of zebras and grasses would decrease.

Option B is the most likely outcome if gazelles were removed from the ecosystem. Gazelles are an important prey species for lions, and zebras also rely on grazing in the same area. If the gazelle population were to suddenly disappear, both the lions and the zebras would have less food available, leading to a decrease in their populations. The removal of gazelles would have little effect on the populations of hyenas and grasses, so options A and C can be ruled out. Option D, the decrease in populations of zebras and grasses, is also feasible but less likely than option B.