14. Suppose the production function for good q is given by q = 3k + 2l where k and l are capital and labor inputs. Consider three statements about this function:
I. The function exhibits constant returns to scale.
II. The function exhibits diminishing marginal productivities to all inputs.
III. The function has a constant rate of technical substitution.
Which of these statements is true?
(A) All of them.
(B) None of them.
(C) I and II but not III.
(D) I and III but not II.

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