Concept:The Second Republic (
1979–
1983) depended heavily on crude oil exports, which produced a major economic boom driven by global oil prices.
Explanation:In the
1970s, Nigeria experienced a sharp rise in oil earnings due to high prices in the international market.
This oil wealth continued into the early
1980s, a period that overlapped with the Second Republic.
Oil and gas became the leading contributor to government revenue and foreign exchange.
Other sectors such as agriculture lost their former dominance, while technology and mining played only minor roles at the time.
Therefore, the boom Nigeria experienced during the Second Republic was centred on the oil and gas sector.
Answer:C. Oil and gas