The only answer that makes any sense is C. The British Empire was the sole enemy of the French, fighting them and winning in the Seven Years War. While I am completely unaware of what campaign you are referencing, General Burgoyne partook in many over his years as a British officer, I am certain alliance with the French and splitting New York and Canada were not one of them.
The answer is B. They thought they could benefit from the area's warm climate and fertile soil.
Hope I helped
