Answer:
A. I and II
Step-by-step explanation:
The northeastern china has something called the North East Plains which are a huge portion of plains that land inbetween rivers and mountains, so having plains it would make no sense to have terrace farming, as well as in the midwest of the United States which is basically covered by the great plains, which are endless lands of plain soil. This two regions would be least likely to use terrace farming since they are plains.