The correct answer is A) demonstrates the spread of British imperialism all over the world.
The map shows the British Empire in 1900. This map could help a writer draft a document-based essay about the British Empire because it demonstrates the spread of British imperialism all over the world.
If we look at the map closely, we can see that the British Empire was present in many continents. British colonies were everywhere and represented a great amount of richness for the crown. This is vast information that surely can serve any writer that wants to write an essay on the size and influence of the British Empire through its many colonies.