The civil war created business opportunities for people like Owoicho because?

This question is base on Jerry Agada’s The successes

The civil war created business opportunities for people like Owoicho because:

A. the Ibos were conscripted into the army
B. the exit of the Ibos created a vacuum
C. the Ibos had ventured into other businesses
D. He became the supplier of all essential commodities

Correct Answer:

Option B – the exit of the Ibos created a vacuum