Why did general general charles cornwallis retreat from the carolinas and march north into virginia?

Cornwallis had decided he could not win the Carolinas after suffering losses in  two major battles. As a result, much of his Army was sick or wounded. Everywhere in the area the Americans had gained strength. Also, the Americans had successfully defeated his Loyalist supporters in the area and most of them had dispersed making his fortunes unfavorable

35 is your answer because i looked it up

which statement explains one of the reasons world war 1 was so much more destructive than earlier conflicts