Whay is one reason why nigerians remain poor, despite their country's large oil deposits? infrastructure, subsistence farming, corruption, microcredit

Infrastructure is the total of roads and organizational structures in the country, and it's not bad - if anything, a bad infrastructure could be bad.

subsidence farming would mean that the farmers farm for themselves: this wouldn't make them poor, but instead would give them food!

corruption is the reason: the profits are stolen by the officials!

microcredits are small credits for the poor, they're also generally good for the poor.