Deer need food and water to survive. Food and water for the deer population are B. limiting factor.
Limiting factors limit the growth, abundance, or distribution of an organism or a population of organisms in an ecosystem. So, without food and water, the deer population could not make it.
Carrying capacity is the maximum population size, so that answer doesn't make sense. Population growth is self-explanatory. D is incorrect because we don't know if food and water are scarce for the deer.