Some people were critical about Great Britain's imperialist practices because Britain had a history of genocide in other country's they took over.
I believe it is the third option but it could be the fourth.
You need to check each sentence for errors. If there's an extra letter, such as the "s" in "reads" (#1) you need to use the symbol which deletes a letter. If a sentence/word is missing a word/letter... you need to use a symbol to show that a word/letter should be shown there.
The answer is C I believe. I read this in 9th grade :) Really good book
My best guess is B. The others look questionable