Concept:The Europeans arrived in Nigeria in a sequential process of exploration, trade, missionary activity, and eventual imperial conquest.
Explanation:First, European explorers came to study the land and its people.
Next, traders arrived to engage in commerce, including the slave and palm oil trades.
Then, Christian missionaries entered to spread their religion and education.
Finally, imperialists moved in to establish political control and dominate the economy.
Therefore, the correct order is explorer, trader, missionaries and imperialists.
Answer:B. Explorer, trader, missionaries and imperialists