Answer:the answer is B.the population will decrease.
Step-by-step explanation:
The population will decrease because since the grassland is turning into a desert due to overgrazing, it will be causing the grass to die out, and since the grass is dying out, the grass eating native organisms population will start to go down as well because there will be no more grass to eat from, so therefore i think the answer is B. The population will decrease.
I hope this helps :3