The U.S. economy's Production Possibilities Frontier is made up of two goods: oranges and automobiles. The U.S. economy moves from point A, where it produces 100 oranges and 200 cars, to point B, where it produces 200 oranges and 150 cars. It follows that

1)Point B may be an inefficient point

2)There is not enough information to answer the question

3)Point A is an inefficient point.

4)Point B is an inefficient point

What number is correct?