what was the mistake British general Charles Cornwallis made that ultimately caused his defeat?

a. he missed calculated the strength of the continental army in Charlottesville, VA
b. he failed to listen to Benedict Arnold, who informed him of key information about the Americans.
c. he retreated to Yorktown, where he was trapped.
d. he failed to cut off supply routes in the Carolinas.

c. he retreated to Yorktown, where he was trapped.

The mistake that British General Charles Cornwallis made that ultimately caused his defeat was c. he retreated to Yorktown, where he was trapped.