They were tired of the direct rule of the king of England so a indirect rule was a welcome change to them.
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Answer:
A. African slavery
Explanation:
Although we know that slavery was an important part of British Empire it was not a part of their system after 1830s. To be precise in 1833, British Empire prohibited slave trade inside their domain. This was in important change, that rearranged the position of the whole Empire.
The answer is C. defeated the Sultan's forces
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