The production function for hockey sticks (H) is given by H = 3K0.4L0.6. The production function for basketballs (B) is given by B = K0.4+ L, where K = capital units and L = labor units.

Group of answer choices

a. For B, both L and K have decreasing marginal productivity.

b. For B, K has decreasing marginal productivity whereas L has constant marginal productivity.

c. For H, both L and K have constant marginal productivity.

d. Both H and B exhibit decreasing returns to scale.