A country's total population is rising while agricultural land per person is falling. What is the most direct reason if total agricultural land remains constant?

Correct answer: The same agricultural land is being shared among more people

Per-capita agricultural land means the amount of agricultural land available for each person. It is found by dividing total agricultural land by total population. If the land area stays constant while the population rises, the denominator of this ratio becomes larger, so the amount available to each person must fall.

For example, if a fixed area is shared by 100 people and later by 200 people, each person receives only half as much land, assuming equal sharing. Therefore, option A is correct: the same agricultural land is being shared among more people. The other options contradict the stated condition or confuse total land with land per person. The conclusion is about the average available amount, not necessarily equal individual ownership.