As a Presidential Candidate, Barack Obama Argued That Racial Prejudice

As a presidential candidate, Barack Obama argued that racial prejudice is one of America's defining social problems. He was implicitly acknowledging that

A) low-income women of all ethnicities see marriage as having few benefits.
B) membership in socially constructed categories of race and ethnicity can affect people's life chances.
C) race is constructed almost entirely through interaction.
D) racism is driven by economic factors, and any solution to racism must involve affirmative action.