Concept:Over-population refers to a situation where the number of people in an area is too large relative to the resources available for them.
Explanation:A place is over-populated when its population exceeds the resources needed to support that population.
Those resources include food, water, shelter, and healthcare.
When there are more people than resources can sustain, living standards tend to fall.
This situation is best described as an imbalance between population size and available resources.
Therefore, the correct option is A.
Answer:A. The population exceeds available resources.