Before 1945, the component units of Nigeria were
states
regions
districts
provinces
Correct answer is D
The Provinces of Nigeria are a former administrative division in Nigeria, which were in use in Colonial Nigeria and shortly after independence; from 1900 to 1967. They were altered many times through their history. They were divided into divisions, some of these were further subdivided into native authorities. Northern Nigeria and Southern Nigeria were also sometimes known as the Northern Provinces or Southern Provinces respectively. Currently Nigeria uses states as its administrative division.