Passage Summary: Comparing cows and ostriches: ostriches need less space and reproduce faster, and although they are more expensive to start with, they eventually make much more money than cattle.

Reasoning: Ostrich farming requires less land and fewer animals to start than cattle ranching, and while it has higher initial costs, it eventually yields significantly higher income.

Analysis: This is a comparison of efficiency and profitability between two types of livestock. We are given specific metrics: land use, reproduction rates, and eventual income. Since ostriches reproduce faster and require less land (one acre for two pairs versus two acres per cow), it is highly likely that an ostrich farm can produce more 'units' of livestock per acre than a cattle ranch. When looking for the best supported statement, focus on a synthesis of these efficiency gains or the financial upside mentioned at the end of the stimulus.