Which of the Following Reasons Is Not a Likely Explanation

Which of the following reasons is not a likely explanation as to why college completion rates are greater, on average, for whites than for blacks?

A) Tuition costs are lower for whites than blacks.
B) Whites have access to more financial capital to pay for college than blacks.
C) Postcollege wages are higher for whites than for blacks.
D) Whites have greater access to higher quality public education at the elementary and secondary level.
E) Whites are more able to postpone earnings at age 18 than are blacks.