【单选题】

Which of the following best explains the sentence "That's not a black problem or a white problem: it's a British problem." in the last paragraph
A．(A) Black boy's underachievement is not a problem of the black only but of all the British.

B．(B) Differentiating between black people and white people is a racial discrimination against the black.
C．(C) The origin of black boys' underperformance lies in the British education system, rather than any ethnical difference.
D．(D) Black boy's underperformance is not a racial problem but an educational problem of all British.