Rod has a business making silver and gold jewelry charms in the shapes of molecules. he has five metalsmiths who work for him. one week, his production possibilities curve shifts inward. what could explain this shift?

a prominent actor begins displaying one of rod's jewelry charms.

rod hires two new metalsmiths, and they increase his production.

the price of gold decreases, allowing rod to increase his gold supply.

two metalsmiths catch a viral infection and take sick days.