Consider a Production Possibilities Curve for an Economy Producing Bicycles

Consider a production possibilities curve for an economy producing bicycles and video game players. It is possible to increase the production of bicycles without sacrificing video game players if:

A) ​the production possibilities curve shifts outward due to technological progress.
B) ​the production possibilities curve shifts outward due to increased immigration (which enlarges the labor force) .
C) ​the economy moves from a point inside the production possibilities curve to a point on the curve.
D) ​any of the above occur.