Technically, all of these answers are ways to revise your work. I would go with B, Run a spell check and correct errors because it looks like the most accurate way to edit documents.
Answer:
Explanation:
The reasons for African colonisation were mainly economic, political and religious. ... These countries became involved in a race to acquire more territory on the African continent, but this race was open to all European countries. Britain had had some success in halting the slave trade around the shores of Africa
