The petroleum industry in Nigeria is?
- the sole source of the nation's revenue
- the oldest industry in the country
-
the mainstay of the economy
- a factor in the decline in the nation's foreign reserves
The correct answer is: C
Explanation
The petroleum industry in Nigeria is the largest on the African continent. As of 2014, Nigeria's petroleum industry contributes about 14% to its economy. It is one of the pillars of the nation's economy.