Concept:The last colonial governor-general of Nigeria is the official who held office immediately before independence.
Explanation:Sir James Robertson was the last colonial governor-general of Nigeria.
He served from 1955 until Nigeria gained independence on October 1, 1960.
Lord Lugard was the first governor-general of the colony.
Hugh Clifford served as governor in the 1920s, not as the last one.
Jimmy Carter was an American president and has no connection to Nigeria's colonial history.
Therefore, the correct choice is A. James Robertson.
Answer:A. James Robertson