overpopulation can lead to limited\n○ food.\n○ immunity.\n○ poverty.\n○ competition.

Answer:

A. food

Brief Explanations:

Over - population means more people need more resources. Food is a basic resource, and with over - population, demand for food increases, which can lead to food shortages. Immunity is an individual biological trait, poverty is a socio - economic condition, and competition is a general interaction, but over - population most directly leads to limited food.