Suppose the Production Function for Good Q Is Given by Q

Multiple Choice

Suppose the production function for good q is given by q = 3K + 2 L where K and L are capital and labor inputs.Consider three statements about this function: Which of these statements is true?
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.

A) All of them.
B) None of them.
C) I and II but not III.
D) I and III but not II.
E) only I.