Answer:
2: an increase in food supply.
Step-by-step explanation:
The initial rise in the line of the graph is an example of population growth in a species as a result of an increase in food supply. When there is an increase in food supply, the population of the species will increase because more individuals will be able to survive and reproduce.
The other options are incorrect. A decrease in biodiversity, a decrease in habitat, and an increase in natural predators would all lead to a decrease in the population of a species, not an increase.