When sociologists study the differences in income and wealth between countries,they are studying:

A) social inequality
B) global inequality
C) gross international product
D) cross-national variations in internal stratification
E) all of these choices

Sociologists studying differences in income and wealth between countries are studying global inequality, which refers to the unequal distribution of resources and wealth across countries and regions. Social inequality (A) refers to the unequal distribution of resources within a society, while gross international product (C) refers to the total value of goods and services produced by a country. Cross-national variations in internal stratification (D) refers to the differences in class structure and social inequality between different countries. Therefore, option B is the only correct answer.