Which of the Following Examples of Inequality Is Best Explained

Which of the following examples of inequality is best explained on the macro level?

A) Despite his Princeton degree in economics, Miguel is unable to find a job anywhere but McDonald's.
B) Jasmina, an African American woman, goes to Yale and becomes a doctor like her father.
C) Yu works hard in school and wins a scholarship to study in the U.S. despite his family's low social class in China.
D) Olga has difficulty passing high school courses and, like her parents before her, decides not to attend college.