Which of these conclusions is BEST supported by the data in the document?

A) Post-colonial boundaries are fluid and have changed greatly since independence in the 1960s.

B) Post-colonial boundaries determined in the mid-20th century approximate ethno-linguistic differences.

C) Post-colonial boundaries are vastly different from the distribution of Africa amongst European powers.

D) Post-colonial boundaries determined in the mid-20th century do not take into account ethno-linguistic differences.