The Long-Run Expansion Path for a Firm

Multiple Choice

The long-run expansion path for a firm:

A) is not necessarily linear,but always slopes upward.
B) may be backward-bending,if a firm uses less of one input as output increases.
C) may be backward-bending,if the firm uses more of both inputs as output increases.
D) is always linear,but not necessarily upward-sloping.