Concept:Malthusian theory studies how population growth compares with the growth of food supply.
Explanation:The Malthusian theory states that population grows exponentially while food supply grows arithmetically.
This means population rises much faster than the means of subsistence, which include food and natural resources.
Therefore, Malthus was concerned with the imbalance between population growth rate and available natural resources.
He warned that without checks, population would outstrip resources, causing famine and misery.
Answer:C. population growth rate and natural resources.