In which situation can per person resource availability decrease when population grows?

Correct answer: When resources remain fixed and population increases

Direct answer: Option A is correct. Per-person, or per-capita, availability is found by dividing the available amount of a resource by the number of people sharing it. If the total resource remains fixed while population increases, the same amount must be divided among more people, so the amount available to each person can decrease. For example, a fixed water supply shared by a larger population gives a smaller share per person, assuming other conditions remain the same. Option B would generally increase per-person availability because resources are growing faster than population. Option C also points toward greater availability per person because population falls while resources rise. Option D does not describe a populated situation for sharing resources. Memory cue: fixed total divided among more people means a smaller per-person share.