Answer:
B. Sunlight
Explanation:
The weather conditions as a limit on population growth because It's too cold, dangerous, and isolated. Same with the weather conditions in the dessert, except its bloody hot.
You need space to grow of course.
Also, food is a necessity. Limit on food is dangerous, you need a lot of food to feed a big population.
Sun light is the best answer in my opinion. Hope this helps!