Why did the British turn their attention to the South?

French support in the North was too difficult to overcome.

The American win at Saratoga ended the stalemate in the North.

The South wanted the British to remain in control of America.

British troops required supplies available only in the South.

The correct answer is option 3. The South wanted the British to remain in control of America. Although it is important to note that this is what the British thought, and therefore what they based their decision of turning their attention to the South upon. It does not mean that, in fact, the South wanted the British to remain in control of America.

The British believed that in the South, the majority of the American population wanted them to keep the control of the territory. They names the group of supporters as the "loyalists". That is why they focused their attention to the South and not the North, where they did not believe they had so much support. In the end, this decision would be considered as a mistake, as the British would found out that they have overestimated the support from the "loyalists" who, in fact, ended up supporting the "patriots".