If a Production Possibilities Frontier Is a Downward Sloping Straight

Multiple Choice

If a production possibilities frontier is a downward sloping straight line, it

A) shows that there are no trade-offs in the production process.
B) shows that resources are not efficiently allocated
C) shows that production on the frontier implies that it is not possible to produce more of anything without producing less of something else.
D) shows that resources are unemployed.