Answer:
C. only temporarily rises and then returns to the subsistence level
Step-by-step explanation:
The reasoning behind this idea:
Once the GDP per person increases, there will be an increase in population as now is more affordable to have kids as people is richer
Then, as more people is born the GDP per person goes back into subsistence level.
The problem with this theory is that it does not account for the increase in productivity which generates the GDP per person to increase is permanent hence; the population will increase until productivity allowed and mantain that level. Like occur with the industrial revolution when we move from 1 billon to 7 billion and with an increase in GDP