Use following information to answer Q31-Q35
A firm produces output according to the following function: q = f(L,K) = L0.5K0.5 . The cost of labor is $4 per hour and the rental cost of capital is $12 per hour. The production function exhibits
A. constant returns to scale.
B. increasing returns to scale.
C. decreasing retums to scale.
D. increasing returns to scale for small levels of output, then constant retums to scale, and eventually decreasing returns to scale as output increases,