A President of the United States Promises to Produce More

A president of the United States promises to produce more defense goods without any decreases in the production of other goods. This promise can be valid

A) if the United States is producing at a point inside its production possibilities frontier.
B) if the United States is producing at a point beyond its production possibilities frontier.
C) only if the production possibilities frontier shifts rightward.
D) if the United States is producing at a point on its production possibilities frontier.