If an Economy Experiences Constant Opportunity Costs with Respect to Two

Multiple Choice

If an economy experiences constant opportunity costs with respect to two goods,then the production possibilities curve between the two goods will be?

A) Bowed outward or concave from below.
B) A straight,downward-sloping line.
C) Bowed inward or convex from below.
D) Bowed outward until the two goods are equal,and then bowed inward.