Which of these will most likely happen if the plateau pikas are completely removed from the Tibetan plateau grasslands?

A) The ecosystem will become unstable because predators will have fewer
prey, the birds will have fewer nesting sites, and the area downriver will
become vulnerable to flooding without the burrows to aerate the soil and
provide drainage for monsoon rains.

B) The ecosystem will become more stable because the pika will be replaced
by other species of small mammals that can fill the niche, bird species will
adapt to nesting aboveground, and the soils will become compacted
without the burrows.

C) The ecosystem will become unstable because the predators will migrate to
nearby ecosystems, the birds will nest in nearby trees, and the soils will be
aerated by other small mammals.

D)
The ecosystem will become more stable because the pika will no longer be
there to eat the grasses, the birds will migrate to other ecosystems during
nesting season, and the soils will be able to absorb more of the monsoon
rains without the pika burrows.