C) The low income country relies on agriculture for subsistence; the high relies on technology
Step-by-step explanation:
While all four statements apply equally to a comparison of demographics of poor and rich countries, this statement regarding means of subsistence has no overall effect on fertility rate or its treatment as such.
While access to education would mean better understanding of reproduction and hence availability of healthcare in case of complications.
The means of sustenance in themselves are insignificant for this metric.