Gross capital formation in Nigeria 1964-1973, what can be inferred from the histogram above?

A. there was a steady growth of capital formation in the period
B. capital formation in the last two years exactly equalled those of all previous years combined  
C. at the end of the period, Nigeria had become self-sufficient
D. Nigeria experienced serious economic problems during the period
E. Nigeria is one of the richest countries in Africa

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Correct Answer: B