D. Great Britain.
Source: My World History Textbook
"Great Britain, which long opposed construction of the canal for fear that it might fall into enemy hands, benefited more than any other nation... Instead of making Egypt powerful and independent, the Suez Canal provided the excuse for a British invasion and occupation of that country."
Some common problems they faced is that they both expanded their lands and had trouble controlling the old and new territories.
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The answer is D.
extra wording :)
The French and Indian War impacted the colonies economically. As a result of the war, the British were able to expand their influence in the Ohio Valley. This meant the British would profit even more from the lucrative fur trade now that France had left the area.