An Improvement in Technology, All Other Things Remaining Constant, _____

An improvement in technology, all other things remaining constant, _____

A) will always result in a parallel shift of the production possibilities frontier.
B) will never result in a parallel shift of the production possibilities frontier.
C) will be indicated by a movement along the production possibilities frontier.
D) will shift the production possibilities frontier outward but not necessarily to a parallel position.
E) may not shift the production possibilities frontier.