If an economy experiences an increase in its labor force, everything else constant, then (PPF) will?

Question

If an economy experiences an increase in its labor force, everything else constant, then its production possibilities frontier (PPF) will?

a. expand outward but keep its original shape.

b. not expand until capital grows.

c. expand outward largely in the direction of the labor intensive good.

d. expand outward largely in the direction of the capital intensive good.

Answer 1

c. expand outward largely in the direction of the labor intensive good.