Final answer:
The option that does not describe a model for understanding global stratification is (b), which refers to internal social class divisions, not global country rankings.
Step-by-step explanation:
The option that does not describe a model for understanding global stratification is (b) A model that divides people into social classes based on groups that share common social status based on factors like wealth, income, education, and occupation. This description is more applicable to the stratification within societies rather than among different countries. Global stratification models typically focus on the economic status of entire countries, often ranked by measures such as Gross National Product (GNP) or per capita GDP, and classify them in terms such as 'developed' or 'developing', first, second, and third world, or high-income and low-income countries.